TracSpamFilter crashes.

[Mariusz Felisiak]

https://code.djangoproject.com/admin/spamfilter/bayes:

File "/venv/lib/python2.7/site-packages/trac/web/main.py", line 639, in dispatch_request          
  dispatcher.dispatch(req)
File "/venv/lib/python2.7/site-packages/trac/web/main.py", line 271, in dispatch          
  method=method)
File "/venv/lib/python2.7/site-packages/trac/web/chrome.py", line 1447, in render_template          
  fragment, iterable, method)
File "/venv/lib/python2.7/site-packages/trac/web/chrome.py", line 1501, in _render_jinja_template          
  domain)
File "/venv/lib/python2.7/site-packages/trac/web/chrome.py", line 1611, in prepare_template          
  template = self._load_jinja_template(filename, text)
File "/venv/lib/python2.7/site-packages/trac/web/chrome.py", line 1402, in _load_jinja_template          
  return (self.jenv_text if text else self.jenv).get_template(filename)
File "/venv/lib/python2.7/site-packages/jinja2/environment.py", line 883, in get_template          
  return self._load_template(name, self.make_globals(globals))
File "/venv/lib/python2.7/site-packages/jinja2/environment.py", line 857, in _load_template          
  template = self.loader.load(self, name, globals)
File "/venv/lib/python2.7/site-packages/jinja2/loaders.py", line 127, in load          
  code = environment.compile(source, name, filename)
File "/venv/lib/python2.7/site-packages/jinja2/environment.py", line 638, in compile          
  self.handle_exception(source=source_hint)
File "/venv/lib/python2.7/site-packages/jinja2/environment.py", line 832, in handle_exception          
  reraise(*rewrite_traceback_stack(source=source))
File "/venv/lib/python2.7/site-packages/tracspamfilter/templates/admin_bayes.html", line 31, in template          
  disabled="${dblinesreducenum < 10000 or None}" />

We should try to use 1.4.x version.