fix: [eventGraph] prevents bug if object has no attributes
fix: [eventGraph] prevents bug if object has no attributes

devnull-/MISP,devnull-/MISP,devnull-/MISP,SteveClement/MISP,FloatingGhost/MISP,MISP/MISP,FIRSTdotorg/MISP,devnull-/MISP,FIRSTdotorg/MISP,MISP/MISP,MISP/MISP,Rafiot/MISP,FloatingGhost/MISP,Rafiot/MISP,FloatingGhost/MISP,FloatingGhost/MISP,Rafiot/MISP,FIRSTdotorg/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,Rafiot/MISP,SteveClement/MISP,FIRSTdotorg/MISP,SteveClement/MISP,SteveClement/MISP