Revert "Up code quality"

Author: oohnoitz

src/Drivers/ConnectionBase.php

@@ -15,10 +15,8 @@ abstract class ConnectionBase implements ConnectionInterface
 
     /**
      * Internal connection object.
-     * 
-     * @var ConnectionInterface|null
      */
-    protected $connection;
+    protected $connection = null;
 
     /**
      * Sets one or more connection parameters.