FIX bug when setting staff and no ambassador on event.
FIX bug when setting staff and no ambassador on event.

eicher31/compassion-modules,ecino/compassion-modules,ecino/compassion-modules,eicher31/compassion-modules,ecino/compassion-modules,CompassionCH/compassion-modules,eicher31/compassion-modules,maxime-beck/compassion-modules,ecino/compassion-modules,ecino/compassion-modules,maxime-beck/compassion-modules,CompassionCH/compassion-modules,maxime-beck/compassion-modules,maxime-beck/compassion-modules,CompassionCH/compassion-modules,eicher31/compassion-modules,eicher31/compassion-modules,CompassionCH/compassion-modules