- Gitea version (or commit ref): latest 1.15, https://github.com/go-gitea/gitea/commit/0c7927fe48b29769dd5da2d585ecde54dcbb4f4d - Git version: 2.33.0 - Operating system: Ubuntu 20.04 When viewing a certain CSV diff, I see a 500 and this error in the log: ```` 2021/08/27 13:14:14 ...s/context/context.go:195:HTML() [E] Render failed: template: repo/diff/csv_diff:3:15: executing "repo/diff/csv_diff" at <call .root.CreateCsvDiff .file .root.BaseCommit .root.HeadCommit>: error calling call: runtime error: index out of range [-1] ```` I can't share the particular CSV content but will try to fabricate a file that reproduces that error.