title: Offline compression (django_compressor app) error after django upgrade
body: <p>I just upgrade Django 1.4.2 to 1.5 and I started to get an error on <strong>django_compressor</strong>.</p>
  
  <pre><code>You have offline compression enabled but key "eb225276268ea55d3b90c71df63109d9" is missing from offline manifest. You may need to run "python manage.py compress".
  </code></pre>
  
  <p>Also, I updated django_compressor to the last version (actual 1.2), and still getting the same error. </p>
  
  <p>When I try <code>python manage.py compress</code> I am noticed that: </p>
  
  <pre><code>c:\python27\lib\site-packages\django\utils\hashcompat.py:9: DeprecationWarning: django.utils.hashcompat is deprecated; use hashlib instead DeprecationWarning)
  </code></pre>
  
  <p>Is this notice related with the offline compression error? </p>
  
  <p><strong>[UPDATED]</strong>
  I am finding another interesting thing...</p>
  
  <p>In the template that I am having problem I removed all css that should be compressed:</p>
  
  <pre><code> {% extends "base.html" %}
      {%  block head %}
          {% load compress %}
          {% compress css %}
  
          {% endcompress %}
      {% endblock %}
  ...
  </code></pre>
  
  <p>I ran python manage:</p>
  
  <pre><code>python manage.py compress 
  python manage.py collectstatic   --noinput
  </code></pre>
  
  <p>without errors.</p>
  
  <p>But... The problem still happen. </p>
  
  <pre><code>You have offline compression enabled but key "e764a8b7e7e314ed8c98aa5d25fc76b4" is missing from offline manifest. You may need to run "python manage.py compress".
  1   {% extends "base.html" %}
  2   {% block head %}
  3   {% load compress %}
  4   {% compress css %}
  5   
  6   {% endcompress %}
  7   {% endblock %}
  8   
  </code></pre>
  
  <p>Another important information: the .html file was listed when I ran <code>python manage.py compress</code></p>