coverity #24442, add check on nullness of primary particles pointer
coverity #24442, add check on nullness of primary particles pointer

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Physics,adriansev/AliPhysics,lcunquei/AliPhysics,SHornung1/AliPhysics,mpuccio/AliPhysics,fbellini/AliPhysics,victor-gonzalez/AliPhysics,adriansev/AliPhysics,pchrista/AliPhysics,mkrzewic/AliPhysics,dmuhlhei/AliPhysics,dstocco/AliPhysics,preghenella/AliPhysics,kreisl/AliPhysics,victor-gonzalez/AliPhysics,lcunquei/AliPhysics,lfeldkam/AliPhysics,dlodato/AliPhysics,alisw/AliPhysics,dstocco/AliPhysics,mpuccio/AliPhysics,adriansev/AliPhysics,mkrzewic/AliPhysics,fbellini/AliPhysics,amaringarcia/AliPhysics,kreisl/AliPhysics,ALICEHLT/AliPhysics,victor-gonzalez/AliPhysics,fcolamar/AliPhysics,jgronefe/AliPhysics,amaringarcia/AliPhysics,carstooon/AliPhysics,fcolamar/AliPhysics,rderradi/AliPhysics,adriansev/AliPhysics,AudreyFrancisco/AliPhysics,yowatana/AliPhysics,preghenella/AliPhysics,hzanoli/AliPhysics