ruff

3f6c65e7 - [red-knot] Fix merged type after if-else without explicit else branch (#14621)

[red-knot] Fix merged type after if-else without explicit else branch (#14621) ## Summary Closes: https://github.com/astral-sh/ruff/issues/14593 The final type of a variable after if-statement without explicit else branch should be similar to having an explicit else branch. ## Test Plan Originally failed test cases from the bug are added. --------- Co-authored-by: Carl Meyer <carl@astral.sh> Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>