fix: [upload_analysis_file] Prevent object creation on non-existing events
fix: [upload_analysis_file] Prevent object creation on non-existing events

FIRSTdotorg/MISP,FloatingGhost/MISP,Rafiot/MISP,SteveClement/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,FloatingGhost/MISP,Rafiot/MISP,Rafiot/MISP,SteveClement/MISP,FIRSTdotorg/MISP,MISP/MISP,MISP/MISP,SteveClement/MISP,FloatingGhost/MISP,FloatingGhost/MISP,MISP/MISP,FIRSTdotorg/MISP,FIRSTdotorg/MISP,MISP/MISP,Rafiot/MISP