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Fix T86645: Executing "Operator Cheat Sheet" Crashes Blender

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 Outliner ID operations depends on Outliner context. If this isn't
available, it can just return a context-less version of the enum, that is, a
static enum with all available items. This was already done in case no context
is available at all.