Change highlights for Pagure 5.13.1

• Add the api_project_hascommit endpoint to the API doc
• Do not return a 500 error when the OpenID provider doesn't provide an email
• Fix bug in the default hook
• When failing to find a git repo, log where pagure looked
• Get the default branch of the target repo when linking for new PR
• Add an hascommit API endpoint
• Fixing sample input and output for alias related api
• Add missing API endpoints related to git aliases and re-order a little
• Add support for chardet 4.0+
• Fix support for cchardet
• Make the token_id column of the commit_flags table nullable