[DoctrineMongoDBBundle] added a placeholder for the MongoDB panel

src/Symfony/Bundle/DoctrineMongoDBBundle/Resources/views/Profiler/mongodb_panel.php

@@ -0,0 +1,6 @@
+<h2>Queries</h2>
+
+<?php if (0 == $data->getQueryCount()): ?>
+    <em>No queries.</em>
+<?php else: ?>
+<?php endif; ?>