cms-sw/cmssw — pull request #4975 by Dr15Jones (2014-08-18 12:47:44+00:00)
Title: Fix crash in DTDCSByLumiSummary when MonitorElements are missing

This change properly protects the module from the case where the
MonitorElements it wants from DQMStore are not available.
This fixes a crash seen in the threaded IB RelVals.