Datanode query using full path to node causes NPE

Given

     {
        "xpath": "/cps-ran-schema/NearRTRIC[@idNearRTRIC='11']/attributes",
        "leaves": {
          "ranNFNSSIIdList": [
            "ac8ca1a9-e1ec-4480-8720-c74e92566885"
          ]
        },
        "childDataNodes": []
      },

when querying path

/cps-ran-schema/NearRTRIC[@idNearRTRIC='11']/attributes

2021-06-03T07:15:59.927Z|qtp1622945931-24|| o.onap.cps.rest.exceptions.CpsRestExceptionHandler - Exception occurred
java.lang.NullPointerException: null
at org.onap.cps.cpspath.parser.CpsPathBuilder.exitSingleValueCondition(CpsPathBuilder.java:71)
at org.onap.cps.cpspath.parser.antlr4.CpsPathParser$SingleValueConditionContext.exitRule(CpsPathParser.java:675)
at org.antlr.v4.runtime.Parser.triggerExitRuleEvent(Parser.java:408)
at org.antlr.v4.runtime.Parser.exitRule(Parser.java:642)
at org.onap.cps.cpspath.parser.antlr4.CpsPathParser.cpsPath(CpsPathParser.java:177)
at org.onap.cps.cpspath.parser.CpsPathQuery.createFrom(CpsPathQuery.java:65)
at org.onap.cps.spi.impl.CpsDataPersistenceServiceImpl.queryDataNodes(CpsDataPersistenceServiceImpl.java:177)
at org.onap.cps.spi.impl.CpsDataPersistenceServiceImpl.queryDataNodes(CpsDataPersistenceServiceImpl.java:57)
at org.onap.cps.spi.impl.CpsDataPersistenceServiceImpl$$FastClassBySpringCGLIB$$36e8a6d8.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at org.onap.cps.spi.impl.CpsDataPersistenceServiceImpl$$EnhancerBySpringCGLIB$$4c95c71b.queryDataNodes(<generated>)
at org.onap.cps.api.impl.CpsQueryServiceImpl.queryDataNodes(CpsQueryServiceImpl.java:39)
at org.onap.cps.rest.controller.QueryRestController.getNodesByDataspaceAndAnchorAndCpsPath(QueryRestController.java:48)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)