so gRPC client exception handling

// exception and workflow log
2019-05-08T15:34:45.704Z|| org.onap.so.client.cds.CDSProcessingClient - CDSProcessingClient started                                                                                                                                          
2019-05-08T15:34:45.705Z|| org.onap.so.client.cds.CDSProcessingHandler - Processing blueprint(1.0.0:configuration_over_restconf) for action(1.0.0)                                                          
2019-05-08T15:34:45.817Z|| o.onap.so.client.cds.AbstractCDSProcessingBBUtils - Failed processing blueprint Status{code=INTERNAL, description=lateinit property payload has not been initialized, cause=null}                                 
io.grpc.StatusRuntimeException: INTERNAL: lateinit property payload has not been initialized                                                                                                                                                 
        at io.grpc.Status.asRuntimeException(Status.java:530)                                                                                                                                              
        at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onClose(ClientCalls.java:434)                                                                                                                                        
        at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)                                                                                                                                  
        at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)                                                                                                                                                
        at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)                                                                                                             
        at io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1$1.onClose(CensusStatsModule.java:694)                                                                                                                                 
        at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)                                                                                                                                  
        at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)                                                                                                                                                
        at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)                                                                                                             
        at io.grpc.internal.CensusTracingModule$TracingClientInterceptor$1$1.onClose(CensusTracingModule.java:397)                                                                                                                           
        at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:459)                                                           
        at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:63)                                                                                                                                                                
        at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:546)                                                                                                          
        at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:467)                                                                                                     
        at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:584)                                                                                                     
        at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)                                                        
        at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)                                 
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)                 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)                                                                    
        at java.lang.Thread.run(Thread.java:748)                                                                                                              
2019-05-08T15:34:45.825Z|| org.onap.so.client.cds.CDSProcessingClient - CDSProcessingClient stopped                                                           
2019-05-08T15:34:45.925Z|| o.o.so.bpmn.vcpe.scripts.CreateVcpeResCustService - <aetgt:MsoCompletionRequest xmlns:aetgt="http://org.onap/so/workflow/schema/v1"
                            xmlns:ns="http://org.onap/so/request/types/v1"                                                                                         
                            xmlns:w1aaan0="http://org.onap/so/infra/vnf-request/v1">                                                                                                                                                         
   <w1aaan0:request-info>                                                                                                                                                           
      <w1aaan0:request-id>5fbff3e0-e0ef-4c7b-b8c5-5b1818589e4e</w1aaan0:request-id>                                                                           
      <w1aaan0:action>CREATE</w1aaan0:action>                                                             
      <w1aaan0:source>VID</w1aaan0:source>                                                                
   </w1aaan0:request-info>                                                                                                                                    
   <status-message>Service Instance has been created successfully via macro orchestration</status-message>             
   <serviceInstanceId>3994fbfa-1c93-4ca9-b9ac-c7676e5b239a</serviceInstanceId>                                             
   <mso-bpel-name>BPMN macro create</mso-bpel-name>                                                                                                           
</aetgt:MsoCompletionRequest>                                                                                                                                                                                                                
2019-05-08T15:34:45.926Z|| o.o.so.bpmn.vcpe.scripts.CreateVcpeResCustService -  SUCCESS flow, going to CompleteMsoProcess -                                                                                                                  
<aetgt:MsoCompletionRequest xmlns:aetgt="http://org.onap/so/workflow/schema/v1"                                            
                            xmlns:ns="http://org.onap/so/request/types/v1"                                                                                                                                                                   
                            xmlns:w1aaan0="http://org.onap/so/infra/vnf-request/v1">                                                                                                 
   <w1aaan0:request-info>                                                                                                                                                                                                                    
      <w1aaan0:request-id>5fbff3e0-e0ef-4c7b-b8c5-5b1818589e4e</w1aaan0:request-id>                                                                                                     
      <w1aaan0:action>CREATE</w1aaan0:action>                                                                                                                                         
      <w1aaan0:source>VID</w1aaan0:source>                                                                                                                                                                         
   </w1aaan0:request-info>                                                                                                                              
   <status-message>Service Instance has been created successfully via macro orchestration</status-message>                                                
   <serviceInstanceId>3994fbfa-1c93-4ca9-b9ac-c7676e5b239a</serviceInstanceId>                                                                                      
   <mso-bpel-name>BPMN macro create</mso-bpel-name>                                                                                                           
</aetgt:MsoCompletionRequest>                                                                                                                                                              
2019-05-08T15:34:46.033Z|| org.onap.so.bpmn.common.scripts.MsoUtils - Entered SetSuccessIndicator Method           

AbstractCDSProcessingBBUtils