protect by checking presence of member, before acting on it. process.mix.digitizers.hcal.ho . Needed for DIGI with premixing
full path for muonCustoms; required to be able to inline this customise function
Merge pull request #3519 from franzoni/from-CMSSW_7_1_X_2014-04-25-1400_postLS1Customs

post ls1 customs: consolidate/fix