#8420: Fix traceback on 404 in ChunkedGlibHTTPRequestHandler

self._cleanup does the self._file.close() anyway if the file exists.
The self._file.close() removed here is redundant, and will always
fail on file not found, which is handled in send_head by returning
None for self._file.

src/sugar/network.py

@@ -97,7 +97,6 @@ class ChunkedGlibHTTPRequestHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
                                                gobject.IO_ERR,
                                                self._send_next_chunk)
         else:
-            self._file.close()
             self._cleanup()
 
     def _send_next_chunk(self, source, condition):