chg: Some changes to event defaults
chg: Some changes to event defaults

- Added default analysis value in case it is not set when adding a new event
- Changed the threat level default to undefined if no default has been set

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