Fixed an infinite loop possibility in strip_tags().

This is a security fix; disclosure to follow shortly.

tests/utils_tests/test_html.py

@@ -82,6 +82,9 @@ class TestUtilsHtml(TestCase):
             ('a<p a >b</p>c', 'abc'),
             ('d<a:b c:d>e</p>f', 'def'),
             ('<strong>foo</strong><a href="http://example.com">bar</a>', 'foobar'),
+            # caused infinite loop on Pythons not patched with
+            # http://bugs.python.org/issue20288
+            ('&gotcha&#;<>', '&gotcha&#;<>'),
         )
         for value, output in items:
             self.check_output(f, value, output)