if one side returns a null result, ensure we have the right data type when merging results
if one side returns a null result, ensure we have the right data type when merging results

perfsonar/pscheduler,perfsonar/pscheduler,mfeit-internet2/pscheduler-dev,perfsonar/pscheduler,mfeit-internet2/pscheduler-dev,perfsonar/pscheduler