chg: [datamodel] second step validation for anonymised attribute type
chg: [datamodel] second step validation for anonymised attribute type

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