add barrel simHitCollections to caloParticles only in presence of ticl_barrel modifier

Author: mmusich

SimGeneral/MixingModule/python/caloTruthProducer_cfi.py

@@ -59,8 +59,8 @@
 from Configuration.Eras.Modifier_fastSim_cff import fastSim
 fastSim.toReplaceWith(caloParticles, cms.PSet()) # don't allow this to run in fastsim
 
-from Configuration.Eras.Modifier_phase2_common_cff import phase2_common
-phase2_common.toModify(
+from Configuration.ProcessModifiers.ticl_barrel_cff import ticl_barrel
+ticl_barrel.toModify(
     caloParticles, 
     simHitCollections = cms.PSet(
         hgc = cms.VInputTag(