fixed test break

framework/yii/data/ActiveDataProvider.php

@@ -86,9 +86,9 @@ class ActiveDataProvider extends BaseDataProvider
 		parent::init();
 		if (is_string($this->db)) {
 			$this->db = Yii::$app->getComponent($this->db);
-		}
+			if ($this->db === null) {
-		if ($this->db === null) {
+				throw new InvalidConfigException('The "db" property must be a valid DB Connection application component.');
-			throw new InvalidConfigException('The "db" property must be a valid DB Connection application component.');
+			}
 		}
 	}