a80c1e50bc
Enum's itemf callback can be called without context in some cases (UI, doc generation...). Python's enum properties did not handle this at all - it's kind of odd this did not cause more trouble and wasn't notice earlier... Probably dynamic enums using context are not much used in py code. Note about nodes: those are heavy users of dynamic enum with context. Now, we expect `NodeCategory.poll()` and `NodeItem.poll()` to always be called with a valid context (since when there is no context available, we can assume `poll()` is always True). `NodeCategory.items()`, however, must accept NULL context, so if you use custom `items` callable for your custom node categories, you may need to update it (as was done here for builtin `node_group_items()`).