Fix crash on recursive alias with an optional type #17350
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Diff from mypy_primer, showing the effect of this PR on open source code: ibis (https://github.com/ibis-project/ibis)
- ibis/common/graph.py:464: error: Argument "filter" to "map" of "Node" has incompatible type "Callable[[Node], bool] | Pattern | _ClassInfo | None"; expected "Callable[[Node], bool] | None" [arg-type]
+ ibis/common/graph.py:464: error: Argument "filter" to "map" of "Node" has incompatible type "FinderLike | None"; expected "Callable[[Node], bool] | None" [arg-type]
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Fixes #17132
Fix is trivial, we don't need that extra
get_proper_type().