dont' send assign webhooks when creating issue (#5365)

models/issue_assignees.go

@@ -159,12 +159,13 @@ func (issue *Issue) changeAssignee(sess *xorm.Session, doer *User, assigneeID in
 		return fmt.Errorf("createAssigneeComment: %v", err)
 	}
 
-	mode, _ := accessLevel(sess, doer.ID, issue.Repo)
-	if issue.IsPull {
-		// if pull request is in the middle of creation - don't call webhook
+	// if issue/pull is in the middle of creation - don't call webhook
 	if isCreate {
 		return nil
 	}
+
+	mode, _ := accessLevel(sess, doer.ID, issue.Repo)
+	if issue.IsPull {
 		if err = issue.loadPullRequest(sess); err != nil {
 			return fmt.Errorf("loadPullRequest: %v", err)
 		}