fix: Add a baseurl if none is set for the stix framing
fix: Add a baseurl if none is set for the stix framing

- otherwise we end up with a namespace leading to an empty URL which apparently is the STIX library's kwqryptonite

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