title: Why the pip brokes? Django testing on development server
body: <p>It is not visible for user in browser, but in Terminal I see:</p>
  
  <pre><code>[04/Apr/2014 11:32:52] "GET /admin/core_backend/exhibitor/ HTTP/1.1" 200 15568
  Traceback (most recent call last):
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/wsgiref/handlers.py", line 86, in run
      self.finish_response()
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/wsgiref/handlers.py", line 128, in finish_response
      self.write(data)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/wsgiref/handlers.py", line 212, in write
      self.send_headers()
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/wsgiref/handlers.py", line 270, in send_headers
      self.send_preamble()
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/wsgiref/handlers.py", line 194, in send_preamble
      'Date: %s\r\n' % format_date_time(time.time())
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 324, in write
      self.flush()
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 303, in flush
      self._sock.sendall(view[write_offset:write_offset+buffer_size])
  error: [Errno 32] Broken pipe
  
  [04/Apr/2014 11:32:52] "GET /admin/core_backend/exhibitor/ HTTP/1.1" 500 59
  ----------------------------------------
  Exception happened during processing of request from ('127.0.0.1', 57862)
  Traceback (most recent call last):
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/SocketServer.py", line 593, in process_request_thread
      self.finish_request(request, client_address)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/SocketServer.py", line 334, in finish_request
      self.RequestHandlerClass(request, client_address, self)
    File "/Users/andi/.virtualenvs/daftdjango/lib/python2.7/site-packages/django/core/servers/basehttp.py", line 126, in __init__
      super(WSGIRequestHandler, self).__init__(*args, **kwargs)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/SocketServer.py", line 651, in __init__
      self.finish()
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/SocketServer.py", line 710, in finish
      self.wfile.close()
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 279, in close
      self.flush()
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 303, in flush
      self._sock.sendall(view[write_offset:write_offset+buffer_size])
  error: [Errno 32] Broken pipe
  ----------------------------------------
  [04/Apr/2014 11:32:52] "GET /admin/core_backend/exhibitor/ HTTP/1.1" 200 15568
  </code></pre>