If findObject returns none but object_id != 0 use the selected object
If findObject returns none but object_id != 0 use the selected object

This works around an issue where the tool handles overlap the selected
object and thus context menu entries would not work.

Fixes #64

Curahelper/Cura,markwal/Cura,fxtentacle/Cura,senttech/Cura,lo0ol/Ultimaker-Cura,ynotstartups/Wanhao,senttech/Cura,lo0ol/Ultimaker-Cura,markwal/Cura,bq/Ultimaker-Cura,bq/Ultimaker-Cura,ad1217/Cura,DeskboxBrazil/Cura,fxtentacle/Cura,hmflash/Cura,ad1217/Cura,fieldOfView/Cura,quillford/Cura,totalretribution/Cura,ynotstartups/Wanhao,DeskboxBrazil/Cura,Curahelper/Cura,totalretribution/Cura,fieldOfView/Cura,hmflash/Cura,quillford/Cura