neilime/zf2-twb-bundle — pull request #57 by moderndeveloperllc (2014-02-25 17:46:54+00:00)
Title: Allow for a blank message to be sent to the alert helper

This is useful if you are doing something like
```
echo $this->alert($this->flashMessenger()->render(), array('class' => 'alert-danger'), true);
```
`$this->flashMessenger()` already has a short circuit that returns a blank string is there are no messages. This will also allow for the alert message to be a numeric zero.