Clear value from select element when filtering in Angular
<p>I have a basic select element with options that dropdown hooked up to a small set of data which is being filtered using the dropdown. Initially on page load the select element has a value of <code>undefined</code> (according to the console), however after selecting any option it takes on the value of that option.</p>

<p>How can I go back to <code>undefined</code>? Basically I want to be able to select an option in the list that will go back to displaying all of the data. Below is my app on JSBin:</p>

<p><a href="http://jsbin.com/paxatiw/edit?html,js,output" rel="nofollow">App</a></p>