Prevent panic on looking at api "git" endpoints for empty repos

The API endpoints for "git" can panic if they are called on an empty repo. We can simply allow
empty repos for these endpoints without worry as they should just work.

Fix go-gitea#22452

Signed-off-by: Andrew Thornton <[email protected]>

Author: zeripath

routers/api/v1/api.go

@@ -1061,7 +1061,7 @@ func Routes(ctx gocontext.Context) *web.Route {
 					m.Get("/blobs/{sha}", repo.GetBlob)
 					m.Get("/tags/{sha}", repo.GetAnnotatedTag)
 					m.Get("/notes/{sha}", repo.GetNote)
-				}, context.ReferencesGitRepo(), reqRepoReader(unit.TypeCode))
+				}, context.ReferencesGitRepo(true), reqRepoReader(unit.TypeCode))
 				m.Post("/diffpatch", reqRepoWriter(unit.TypeCode), reqToken(), bind(api.ApplyDiffPatchFileOptions{}), repo.ApplyDiffPatch)
 				m.Group("/contents", func() {
 					m.Get("", repo.GetContentsList)