In the default router, if a controller was not specified in the URL,
a default controller is used (IndexController, unless
otherwise requested). With modular controllers, if a module has been
specified but no controller, the dispatcher first looks for this
default controller in the module path, and then falls back on the
default controller found in the 'default', global, namespace.
If you wish to always default to the global namespace, set the
$useDefaultControllerAlways parameter in the front controller:
<?php
$front->setParam('useDefaultControllerAlways', true);