title: Rails 3.1 asset:precompile task failing with "bad URI" error
body: <p>Here is the whole error from <code>rake assets:precompile --trace</code></p>
  
  <pre><code>** Invoke assets:precompile (first_time)
  ** Execute assets:precompile
  rake aborted!
  bad URI(is not URI?): 
  
  Tasks: TOP =&gt; environment
  </code></pre>
  
  <p>Not much to go on.</p>