Caused by {rB919558854d62}.
Same fix as in {rBdc8a43c8755a} -- let RNA enum item callbacks check
for NULL context.
The NULL context is used to extract items for document generation.
Maniphest Tasks: T88251
Differential Revision: https://developer.blender.org/D11391
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
There is a list of attributes, along with operators to add and remove
attributes. For adding, there are a few standard attributes that can be
added quickly, as well as a popup to create a custom attribute.
Ref T76659
Differential Revision: https://developer.blender.org/D8636
