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	Fix PATCH /repos/{owner}/{repo} panic (#14637)
* Fix a runtime error when modifying a repository through API call
Using the `PATCH /repos/{owner}/{repo}` endpoint and attempting to
modify `default_branch` on an empty repository will cause a
panic. This commit adds a check for a nil pointer before attempting
to dereference it.
* Apply suggestions from code review
* Apply suggestions from code review
* Ensure that the git repository is loaded
If you change the default branch for a repository you must change it in
git too. Therefore you must open the repository before changing the
default branch.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Allow empty repos to have their default branches changed
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Anton Khimich <anton.khimicha@mail.utoronto.ca>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Andrew Thornton <art27@cantab.net>
			
			
This commit is contained in:
		@@ -574,8 +574,20 @@ func updateBasicProperties(ctx *context.APIContext, opts api.EditRepoOption) err
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		repo.IsTemplate = *opts.Template
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	}
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	// Default branch only updated if changed and exist
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	if opts.DefaultBranch != nil && repo.DefaultBranch != *opts.DefaultBranch && ctx.Repo.GitRepo.IsBranchExist(*opts.DefaultBranch) {
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	if ctx.Repo.GitRepo == nil {
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		var err error
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		ctx.Repo.GitRepo, err = git.OpenRepository(ctx.Repo.Repository.RepoPath())
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		if err != nil {
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			ctx.Error(http.StatusInternalServerError, "Unable to OpenRepository", err)
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			return err
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		}
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		defer ctx.Repo.GitRepo.Close()
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	}
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	// Default branch only updated if changed and exist or the repository is empty
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	if opts.DefaultBranch != nil &&
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		repo.DefaultBranch != *opts.DefaultBranch &&
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		(ctx.Repo.Repository.IsEmpty || ctx.Repo.GitRepo.IsBranchExist(*opts.DefaultBranch)) {
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		if err := ctx.Repo.GitRepo.SetDefaultBranch(*opts.DefaultBranch); err != nil {
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			if !git.IsErrUnsupportedVersion(err) {
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				ctx.Error(http.StatusInternalServerError, "SetDefaultBranch", err)
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