Careless use of CSS selectors breaks with new BeautifulSoup about zope.testbrowser

[mgedmin]

Stumbled upon another instance of this:

Failed example:
    browser.getLink(id='form.q_3.2_delete').click()
Exception raised:
    Traceback (most recent call last):
      File "/usr/lib/python2.7/doctest.py", line 1315, in __run
        compileflags, 1) in test.globs
      File "<doctest self-review-2014.txt[146]>", line 1, in <module>
        browser.getLink(id='form.q_3.2_delete').click()
      File "/home/mg/src/zopefoundation/zope.testbrowser/src/zope/testbrowser/browser.py", line 319, in getLink
        links = html.select(qa)
      File "/home/mg/src/ivija/.tox/py27-latest/local/lib/python2.7/site-packages/bs4/element.py", line 1376, in select
        return soupsieve.select(selector, self, namespaces, limit, **kwargs)
      File "/home/mg/src/ivija/.tox/py27-latest/local/lib/python2.7/site-packages/soupsieve/__init__.py", line 114, in select
        return compile(select, namespaces, flags, **kwargs).select(tag, limit)
      File "/home/mg/src/ivija/.tox/py27-latest/local/lib/python2.7/site-packages/soupsieve/__init__.py", line 63, in compile
        return cp._cached_css_compile(pattern, namespaces, custom, flags)
      File "/home/mg/src/ivija/.tox/py27-latest/local/lib/python2.7/site-packages/backports/functools_lru_cache.py", line 137, in wrapper
        result = user_function(*args, **kwds)
      File "/home/mg/src/ivija/.tox/py27-latest/local/lib/python2.7/site-packages/soupsieve/css_parser.py", line 214, in _cached_css_compile
        CSSParser(pattern, custom=custom_selectors, flags=flags).process_selectors(),
      File "/home/mg/src/ivija/.tox/py27-latest/local/lib/python2.7/site-packages/soupsieve/css_parser.py", line 1113, in process_selectors
        return self.parse_selectors(self.selector_iter(self.pattern), index, flags)
      File "/home/mg/src/ivija/.tox/py27-latest/local/lib/python2.7/site-packages/soupsieve/css_parser.py", line 946, in parse_selectors
        key, m = next(iselector)
      File "/home/mg/src/ivija/.tox/py27-latest/local/lib/python2.7/site-packages/soupsieve/css_parser.py", line 1100, in selector_iter
        raise SelectorSyntaxError(msg, self.pattern, index)
    SelectorSyntaxError: Malformed class selector at position 10
      line 1:
    a#form.q_3.2_delete