Backport #37193 by @Mohit25022005
fix(api): handle missing base branch in PR commits API
Closes#36366
Previously, the PR commits API returned a 500 Internal Server Error
when the base branch was missing due to an unhandled git "bad revision"
error.
This change:
- Checks for base branch existence before performing git operations
- Returns 404 when the base branch does not exist
- Prevents git errors from surfacing as 500 responses
This improves API robustness and aligns behavior with expected error
handling.
Tested locally by:
- Creating a pull request
- Deleting the base branch
- Verifying that the API returns 404 instead of 500
Co-authored-by: Mohit Swarnkar <mohitswarnkar13@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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