修改个人信息接口优化

@@ -957,9 +957,15 @@ class User extends Api
         $user = $this->auth->getUser();
         $nickname = $this->request->request('nickname');
         $avatar = $this->request->request('avatar', '', 'trim,strip_tags,htmlspecialchars');
-        $user->nickname = $nickname;
-        $user->avatar = $avatar;
-        $user->save();
+        if($nickname || $avatar) {
+            if($nickname) {
+                $user->nickname = $nickname;
+            }
+            if($avatar) {
+                $user->avatar = $avatar;
+            }
+            $user->save();
+        }
         $this->success();
     }