title: How to check if angular is loaded correctly
body: <p>Let's say that I want to reference angularjs from a CDN but I would also like a fallback in case the call to the CDN fails, e.g. pointing to a local js-file. When it comes to JQuery I have seen examples where you would do something like this in javascript:</p>
  
  <pre><code>if(typeof jQuery == 'undefined') {
      ....
  }
  </code></pre>
  
  <p>Is there anything similar for angularjs I can do?</p>