Fixes #7152 - Allow create/update/delete message to be empty, use default message (#7324)

* Fixes #7152 - Allow create/update/delete message to be empty, use default message

* Linting fix

* Fix to delete integration tests

modules/repofiles/delete.go

@@ -198,6 +198,11 @@ func DeleteRepoFile(repo *models.Repository, doer *models.User, opts *DeleteRepo
 		return nil, fmt.Errorf("PushUpdate: %v", err)
 	}
 
+	commit, err = t.GetCommit(commitHash)
+	if err != nil {
+		return nil, err
+	}
+
 	file, err := GetFileResponseFromCommit(repo, commit, opts.NewBranch, treePath)
 	if err != nil {
 		return nil, err

modules/structs/repo_file.go

@@ -8,7 +8,7 @@ package structs
 // FileOptions options for all file APIs
 type FileOptions struct {
 	// message (optional) for the commit of this file. if not supplied, a default message will be used
-	Message string `json:"message" binding:"Required"`
+	Message string `json:"message"`
 	// branch (optional) to base this file from. if not given, the default branch is used
 	BranchName string `json:"branch"`
 	// new_branch (optional) will make a new branch from `branch` before creating the file