Arbitrary PR id in PR URL always leads to first PR in repository

[flozzone]

• Gitea version (or commit ref): 1.14.4
• Git version:
• Operating system: Docker container
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
• Log gist:

Description

For a PR URL with a unparseable PR id like https://try.gitea.io/our-org/custom-project/pulls/[WRONGSYNTAX] the resulting PR is always the first PR in the project, instead of showing a 404 page. Constructing URLs like this can result in wrong URLs and should therefore also result in a 404 page.

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