add JECpayload protection in PhysicsTools/PatUtils/interface/ShiftedJetProducerT.h
re-enabled patMet uncertainty test
Merge pull request #5604 from mmarionncern/CMSSW_7_2_X_2014-09-29-0200_metCodeFix

add JECpayload protection in PhysicsTools/PatUtils/interface/ShiftedJetProducerT.h