500 when viewing a repo without a `master` branch

[yatesco]

• Gitea version (or commit ref): gitea/gitea:latest pulled yesterday
• Git version:git version 2.13.6 (Apple Git-96)
• Operating system: macos
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist:

Description

gitea throws a 500 if you view a repository without a master branch

To reproduce:

• install a fresh gitea
• create a new repo
• git push -u origin some-other-branch
• then view the repo in gitea and it throws a 500

P.S> - Loving gitea - thanks for everyone's hard work!

[lunny]

Because /HEAD is ref: refs/heads/master but there is no master branch.

[lunny]

resolved by #3240