Not really sure why only type and owner_id were cleared here?
Especially when code like `pyrna_struct_CreatePyObject` would check
for both `data` and `type` to be null to consider the pointer as None...
Happens to 'fix' #134311, since now cleared PointerRNA are 'just'
reset to `PointerRNA_NULL`. Would not work if the data was not an
ID PointerRNA though...
NOTE: In general, what is considered an invalid PointerRNA is still very
loosely designed in our code-base, we'll have to address this.
Pull Request: https://projects.blender.org/blender/blender/pulls/134393
e55d478c64