RevTree initialization error when the svn repository is empty

[jesspub@…]

Config:

• Windows XP SP2
• Apache 2.2
• Python 2.5.1
• Trac-0.11dev r5978
• TracRevtreePlugin-0.5.9dev r2564

Traceback (most recent call last):
  File "c:\python25\lib\site-packages\Trac-0.11dev_r5978-py2.5.egg\trac\web\api.py", line 342, in send_error
    'text/html')
  File "c:\python25\lib\site-packages\Trac-0.11dev_r5978-py2.5.egg\trac\web\chrome.py", line 570, in render_template
    template = self.load_template(filename, method=method)
  File "c:\python25\lib\site-packages\Trac-0.11dev_r5978-py2.5.egg\trac\web\chrome.py", line 546, in load_template
    self.templates = TemplateLoader(self.get_all_templates_dirs(),
  File "c:\python25\lib\site-packages\Trac-0.11dev_r5978-py2.5.egg\trac\web\chrome.py", line 329, in get_all_templates_dirs
    for provider in self.template_providers:
  File "c:\python25\lib\site-packages\Trac-0.11dev_r5978-py2.5.egg\trac\core.py", line 65, in extensions
    return filter(None, [component.compmgr[cls] for cls in extensions])
  File "c:\python25\lib\site-packages\Trac-0.11dev_r5978-py2.5.egg\trac\core.py", line 205, in __getitem__
    (cls, e))
TracError: Unable to instantiate component <class 'revtree.web_ui.RevtreeModule'> (int() argument must be a string or a number, not 'NoneType')