ENH: check if VectorImageModel is not null before connecting/disconnecting + add missing disconnections
ENH: check if VectorImageModel is not null before connecting/disconnecting + add missing disconnections

orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB