PWGGA/GammaConv: Fix for trigger decision in data
PWGGA/GammaConv: Fix for trigger decision in data

- Added protection to only call the mimicTrigger function in data in
case a trigger is selected.
- Otherwise the trigger selection with the EMCALTriggerSelection task
will crash for periods/events where there is no trigger present

victor-gonzalez/AliPhysics,AMechler/AliPhysics,adriansev/AliPhysics,adriansev/AliPhysics,alisw/AliPhysics,adriansev/AliPhysics,pchrista/AliPhysics,alisw/AliPhysics,pchrista/AliPhysics,AMechler/AliPhysics,victor-gonzalez/AliPhysics,adriansev/AliPhysics,adriansev/AliPhysics,AMechler/AliPhysics,pchrista/AliPhysics,alisw/AliPhysics,rbailhac/AliPhysics,rbailhac/AliPhysics,adriansev/AliPhysics,AMechler/AliPhysics,pchrista/AliPhysics,alisw/AliPhysics,AMechler/AliPhysics,victor-gonzalez/AliPhysics,pchrista/AliPhysics,alisw/AliPhysics,victor-gonzalez/AliPhysics,alisw/AliPhysics,victor-gonzalez/AliPhysics,rbailhac/AliPhysics,victor-gonzalez/AliPhysics,adriansev/AliPhysics,rbailhac/AliPhysics,victor-gonzalez/AliPhysics,pchrista/AliPhysics,rbailhac/AliPhysics,AMechler/AliPhysics,pchrista/AliPhysics,AMechler/AliPhysics,alisw/AliPhysics,rbailhac/AliPhysics,rbailhac/AliPhysics