Exception in "find" when using htm5lib

[Richard Brooksby]

Exception when finding a tag BeautifulSoup4 when html5lib is installed. Does not occur with lxml. See transcript below and attachment (which also contains the transcript).

Also, try a simple soup.find('h1') on this document and it won't be found with html5lib, but can be found with lxml or without either.

  $ virtualenv bug
  $ bug/bin/pip install BeautifulSoup4
  Downloading beautifulsoup4-4.2.0.tar.gz (138kB): 138kB downloaded
  ...
  $ bug/bin/pip install html5lib
  Downloading html5lib-1.0b1.tar.gz (882kB): 882kB downloaded
  ...
  $ bug/bin/python
  >>> import bs4
  >>> bs4.BeautifulSoup(open('foo.html')).find('body').find('div').find('h1')
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/Volumes/Silverbird-HD/Local/Users/rb/tmp/bs-bug/tool/lib/python2.7/site-packages/bs4/element.py", line 1146, in find
      l = self.find_all(name, attrs, recursive, text, 1, **kwargs)
    File "/Volumes/Silverbird-HD/Local/Users/rb/tmp/bs-bug/tool/lib/python2.7/site-packages/bs4/element.py", line 1167, in find_all
      return self._find_all(name, attrs, text, limit, generator, **kwargs)
    File "/Volumes/Silverbird-HD/Local/Users/rb/tmp/bs-bug/tool/lib/python2.7/site-packages/bs4/element.py", line 495, in _find_all
      i = next(generator)
    File "/Volumes/Silverbird-HD/Local/Users/rb/tmp/bs-bug/tool/lib/python2.7/site-packages/bs4/element.py", line 1185, in descendants
      current = current.next_element
  AttributeError: 'NoneType' object has no attribute 'next_element'