Fix empty commits now showing in repo overview (#7521)

* Fix empty commits now showing in repo overview

* add test

* make fmt

modules/git/commit_info.go

@@ -68,7 +68,9 @@ func (tes Entries) GetCommitsInfo(commit *Commit, treePath string, cache LastCom
 	// get it for free during the tree traversal and it's used for listing
 	// pages to display information about newest commit for a given path.
 	var treeCommit *Commit
-	if rev, ok := revs[""]; ok {
+	if treePath == "" {
+		treeCommit = commit
+	} else if rev, ok := revs[""]; ok {
 		treeCommit = convertCommit(rev)
 	}
 	return commitsInfo, treeCommit, nil