guard the nPho histograms from double counting, should fix HI issues
updated PV label for electrons
Merge pull request #6574 from richard-cms/HIphotonDQM

guard the nPho histograms from double counting, should fix HI issues
Merge pull request #6599 from mandrenguyen/electronLabelFix

updated PV label for electrons
Merge remote branch 'origin/CMSSW_7_3_X' into CMSSW_7_0_X