merge CERN-PH-CMG/CMG_PAT_V5_18_from-CMSSW_5_3_22

This PR contains one commit, which has been recently merged into [cmg-cmssw/CMG_PAT_V5_18_from-CMSSW_5_3_22](https://github.com/CERN-PH-CMG/cmg-cmssw/tree/CMG_PAT_V5_18_from-CMSSW_5_3_22) at https://github.com/CERN-PH-CMG/cmg-cmssw/pull/146.