Fix #20175: Fix bad result for pagination when used with GridView

framework/data/SqlDataProvider.php

@@ -7,7 +7,6 @@
 
 namespace yii\data;
 
-use Yii;
 use yii\base\InvalidConfigException;
 use yii\db\Connection;
 use yii\db\Expression;
@@ -150,10 +149,8 @@ class SqlDataProvider extends BaseDataProvider
                     $keys[] = call_user_func($this->key, $model);
                 }
             }
-
             return $keys;
         }
-
         return array_keys($models);
     }