更新

app/Admin/Controllers/UserController.php

@@ -31,7 +31,13 @@ class UserController extends AdminController
             }
         });
         $grid->column('mobile','手机号');
-        $grid->column('user_info.nickname','昵称');
+        $grid->column('user_info.nickname','昵称')->display(function($res){
+            if(isset($res)&&!empty($res)){
+                return $res;
+            }else{
+                return "";
+            }
+        });
 
         $grid->column('pid','上级ID');
         $grid->column('sex','性别')->using([1=>'男',2=>'女'])->label(['','primary','danger']);