add protection for negative zdc energy
add protection for negative zdc energy

rbailhac/AliPhysics,rihanphys/AliPhysics,mpuccio/AliPhysics,adriansev/AliPhysics,adriansev/AliPhysics,alisw/AliPhysics,mpuccio/AliPhysics,adriansev/AliPhysics,adriansev/AliPhysics,victor-gonzalez/AliPhysics,pchrista/AliPhysics,victor-gonzalez/AliPhysics,AMechler/AliPhysics,adriansev/AliPhysics,alisw/AliPhysics,victor-gonzalez/AliPhysics,rbailhac/AliPhysics,nschmidtALICE/AliPhysics,pchrista/AliPhysics,victor-gonzalez/AliPhysics,rbailhac/AliPhysics,pchrista/AliPhysics,rbailhac/AliPhysics,rihanphys/AliPhysics,AMechler/AliPhysics,alisw/AliPhysics,AMechler/AliPhysics,mpuccio/AliPhysics,nschmidtALICE/AliPhysics,alisw/AliPhysics,nschmidtALICE/AliPhysics,pchrista/AliPhysics,pchrista/AliPhysics,victor-gonzalez/AliPhysics,AMechler/AliPhysics,mpuccio/AliPhysics,mpuccio/AliPhysics,adriansev/AliPhysics,pchrista/AliPhysics,rbailhac/AliPhysics,mpuccio/AliPhysics,nschmidtALICE/AliPhysics,victor-gonzalez/AliPhysics,nschmidtALICE/AliPhysics,rihanphys/AliPhysics,alisw/AliPhysics,pchrista/AliPhysics,AMechler/AliPhysics,rbailhac/AliPhysics,mpuccio/AliPhysics,rihanphys/AliPhysics,rihanphys/AliPhysics,alisw/AliPhysics,alisw/AliPhysics,AMechler/AliPhysics,rbailhac/AliPhysics,victor-gonzalez/AliPhysics,AMechler/AliPhysics,nschmidtALICE/AliPhysics,nschmidtALICE/AliPhysics,rihanphys/AliPhysics,rihanphys/AliPhysics,adriansev/AliPhysics