[fw-mvc] Preventing controller dispatch from a from plugin.

Hi all,

I'm writing an auth plugin that should redirect the user to the login
page if she is not logged in. After the call to
Zend_Controller_Action_Helper_Redirector::gotoUrl the controller
action gets called anyway.
Calling gotoUrlAndExit() is not an options since it will kill the unit
tests interpreter.

I dug into the code, but couldn't find a way to stop the action from
being called.

Regards

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