test_fallback_success: missing skip conditioning

[yarikoptic]

with 0.12.0~rc1+git79-g50eff60

======================================================================
FAIL: test_fallback_success (pandas.io.tests.test_html.TestReadHtmlLxml)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_html.py", line 449, in test_fallback_success
    'html5lib'])
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/tests/test_html.py", line 420, in run_read_html
    return read_html(*args, **kwargs)
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/html.py", line 906, in read_html
    attrs)
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/html.py", line 765, in _parse
    parser = _parser_dispatch(flav)
  File "/home/yoh/deb/gits/pkg-exppsy/pandas/debian/tmp/usr/lib/python2.7/dist-packages/pandas/io/html.py", line 723, in _parser_dispatch
    raise AssertionError("You're using a version"
AssertionError: You're using a version of BeautifulSoup4 (4.2.0) that has been known to cause problems on certain operating systems such as Debian. Please install a version of BeautifulSoup4 != 4.2.0, both earlier and later releases will work.

[cpcloud]

@yarikoptic can u test again? thanks.

[cpcloud]

i think this can be closed via #4257