Cannot add review comment

[jonasfranz]

• Gitea version (or commit ref): 6e03390 (1.5+)
• Can you reproduce the bug at https://try.gitea.io:
  • Yes: https://try.gitea.io/go-gitea/chardet/pulls/1/files

Description

If I try to add a review comment at try.gitea.io it results in an unreported error.

[lafriks]

Fixed by #4682