fix: [API] Empty strings should be embedded in an array for the JSON output
fix: [API] Empty strings should be embedded in an array for the JSON output

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