Blender Git Loki

Fix T75973: don't show raw Python errors to users for invalid shortcut paths

There are cases when a user can accidentally assign an operator to toggle an
invalid property to e.g. left click, which shows Python errors to the users.
Rather than throw an error and e.g. break 3D viewport selection for the user,
just print an error to the console.

The root cause of such bugs should be fixed as well, but a working Blender
is most important here.