type conversion and zero division errors when there are no code coverage results

[ryanjoneil@…]

If something goes wrong generating code coverage results, and they are not entered into the database, viewing an individual build's results will give this error:

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/trac/web/modpython_frontend.py", line 206, in handler
    dispatch_request(mpr.path_info, mpr, env)
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 139, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 107, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-i686/egg/bitten/trac_ext/web_ui.py", line 598, in process_request
  File "build/bdist.linux-i686/egg/bitten/trac_ext/web_ui.py", line 714, in _render_reports
  File "build/bdist.linux-i686/egg/bitten/trac_ext/summarizers.py", line 101, in render_summary
TypeError: int() argument must be a string or a number

Patch included.

[cmlenz]

Modified patch applied in r419. Better late than never :-/

Thanks!