Merge branch 'fix/#2651-close-cursor-should-not-throw-exceptions-in-pdo-sqlsrv' into 2.5

Backport #2651 to 2.5.x

lib/Doctrine/DBAL/Driver/PDOStatement.php

@@ -82,6 +82,20 @@ class PDOStatement extends \PDOStatement implements Statement
         }
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function closeCursor()
+    {
+        try {
+            return parent::closeCursor();
+        } catch (\PDOException $exception) {
+            // Exceptions not allowed by the interface.
+            // In case driver implementations do not adhere to the interface, silence exceptions here.
+            return true;
+        }
+    }
+
     /**
      * {@inheritdoc}
      */