When collecting operators for the operator cheatsheet (Help menu), `node.interface_item_new` gave an error because its property `active_item` could not gather items. This happened because `context` was unavailable to its `get_items` method at that time. This commit refactors the method to return early in case the context is not found. Pull Request: https://projects.blender.org/blender/blender/pulls/145930