Blender Git Loki

Fix T86921: Executing "Operator Cheat Sheet" Crashes Blender

This was only happening without an active object.

The "Operator Cheat Sheet" operator collects info about all operators,
and as part of that executes the callbacks to create dynamic enums. The
callback to enumerate the geometry operators (introduced in
rB370d6e50252b) attribute domains depends on a context object. If this
isn't available, we just have to return `DummyRNA_NULL_items`.

Maniphest Tasks: T86921

Differential Revision: https://developer.blender.org/D10814