fix: [taxonomy] avoid MISP becoming unhappy when trying to enable tags for a non-existing taxonomy
fix: [taxonomy] avoid MISP becoming unhappy when trying to enable tags for a non-existing taxonomy

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