title: Ignoring undefined data / vars in an underscore template
body: <p>Still learning backbone so bear with me;</p>
  
  <p>I'm trying to add a new model with blank fields to a view, but the template I've created has a whole bunch of</p>
  
  <pre><code>&lt;input value="&lt;%= some_value %&gt;" type="whatever" /&gt;
  </code></pre>
  
  <p>Works perfectly fine when fetching data, it populates it and all goes well. The trouble arises when I want to create a new (blank) rendered view, it gives me</p>
  
  <pre><code>Uncaught ReferenceError: some_value is not defined
  </code></pre>
  
  <p>I can set <code>defaults</code> (I do already for a few that have default values in the db) but that means typing out over 40 of them with blanks; is there a better way of handling this?</p>
  
  <p>I'm fiddling around with the underscore template itself, trying something like <code>&lt;%= if(some_value != undefined){ some_value } %&gt;</code> but that also seems a bit cumbersome.</p>