While running tests related to translator.py, the variables nested and function are throwing Errors.

Traceback (most recent call last):
File "/home/otc/ONAP/has/conductor/.tox/cover/local/lib/python2.7/site-packages/mock/mock.py", line 1305, in patched
return func(*args, **keywargs)
File "conductor/tests/unit/controller/test_translator.py", line 200, in test_parse_optimization
opt), expected_parse)
File "conductor/controller/translator.py", line 766, in parse_optimization
if not nested:
UnboundLocalError: local variable 'nested' referenced before assignment