forked from gitea/gitea

If you attempt to merge to a branch which on a PR there will be a nil pointer error in the pull request checker. This panic is uncaught and will bring down the gitea server. This PR adds protection to prevent this.
If you attempt to merge to a branch which on a PR there will be a nil pointer error in the pull request checker. This panic is uncaught and will bring down the gitea server. This PR adds protection to prevent this.