fix: Handling the stix file title None case
fix: Handling the stix file title None case

MISP/MISP,TheDr1ver/MISP,TheDr1ver/MISP,FloatingGhost/MISP,SteveClement/MISP,Rafiot/MISP,TheDr1ver/MISP,Rafiot/MISP,MISP/MISP,Rafiot/MISP,SteveClement/MISP,FloatingGhost/MISP,MISP/MISP,FIRSTdotorg/MISP,devnull-/MISP,FIRSTdotorg/MISP,FloatingGhost/MISP,SteveClement/MISP,MISP/MISP,TheDr1ver/MISP,devnull-/MISP,Rafiot/MISP,FIRSTdotorg/MISP,SteveClement/MISP,SteveClement/MISP,devnull-/MISP,FIRSTdotorg/MISP,FloatingGhost/MISP,devnull-/MISP,MISP/MISP