fix: Attribute deletes are again synced correctly
fix: Attribute deletes are again synced correctly

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