Fix external image editor (needs to be a list, otherwise extends adds each character as a list item).

Note: The default value ("start") on windows doesn't work. Start is not a real program.

release/scripts/op/image.py

@@ -50,6 +50,8 @@ class EditExternally(bpy.types.Operator):
                 # and will include a trailing backslash, so we strip it.
                 image_editor.rstrip('\\')
                 image_editor = ["open", "-a", image_editor]
+            else:
+                image_editor = [image_editor]
 
         return image_editor