Handle and propagate errors when checking if paths are Dirs, Files or Exist (#13186)
* Ensure errors from IsDir propagate
* Handle errors when checking IsFile
* Handle and propagate errors from IsExist
* Update modules/templates/static.go
* Update modules/templates/static.go
* Return after ctx.ServerError
* Apply suggestions from code review
* Fix tests
The previous merge managed to break repo_form.go
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lauris BH <lauris@nix.lv>
742e21aeba