Fix error when there's no writeable addressbook source (#1489162)

Aleksander Machniak

2013-06-11 ae80b5a309be69a47b438e2dc1e342735b5e22aa

 program/include/rcmail.php

@@ -228,6 +228,11 @@
    }

    if (!$contacts) {
      // there's no default, just return
      if ($default) {
        return null;
      }

      self::raise_error(array(
        'code' => 700, 'type' => 'php',
        'file' => __FILE__, 'line' => __LINE__,