Tp5.1判断对象是否为空

$teamLst->isEmpty()

    $teamLst = TeamModel::order('sort asc,id desc')->paginate(10,false,['query'=>request()->param()]);
        if(request()->isGet()){
            $option = input('get.option');
            $val  = input('get.val');
            switch( $option ){
                case 1:
                    $teamLst = TeamModel::where('id',intval($val))
                        ->where('isshow',1)
                        ->paginate(10,false,['query'=>request()->param()]);
                    break;
                case 2:
                    $teamLst =TeamModel::where('title','like',"%$val%")
                        ->where('isshow',1)
                        ->paginate(10,false,['query'=>request()->param()]);
                    break;
            }
            if($teamLst->isEmpty()){
                return json(['status'=>400,'msg'=>'暂无数据']);
            }else{
                $this->assign('teamLst',$teamLst);
            }
        }