NOJIRA:  Enhancements to logging & error handling related to how DLM decides whether a user receives a fragment;  should make troubleshooting much clearer
NOJIRA:  Fix unchained Exception;  Remove superfluous isDebugEnabled()
Merge pull request #402 from drewwills/DLM_Error_Handling_Enhancements

UP-4224  Enhance logging & error handling related to DLM fragment audience determination.