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cbe94b09 - [ty] Support empty function bodies in `if TYPE_CHECKING` blocks (#19372)

[ty] Support empty function bodies in `if TYPE_CHECKING` blocks (#19372) ## Summary Resolves https://github.com/astral-sh/ty/issues/339 Supports having a blank function body inside `if TYPE_CHECKING` block or in the elif or else of a `if not TYPE_CHECKING` block. ```py if TYPE_CHECKING: def foo() -> int: ... if not TYPE_CHECKING: ... else: def bar() -> int: ... ``` ## Test Plan Update `function/return_type.md` --------- Co-authored-by: Carl Meyer <carl@astral.sh>