fix: [sync] Undefined index when pushing sightings
fix: [sync] Undefined index when pushing sightings

MISP/MISP,MISP/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP