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-rw-r--r--bs4/element.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/bs4/element.py b/bs4/element.py
index ff7c972..c053181 100644
--- a/bs4/element.py
+++ b/bs4/element.py
@@ -1030,7 +1030,10 @@ class SoupStrainer(object):
and not isinstance(match_against, basestring)):
result = markup in match_against
elif hasattr(match_against, 'items'):
- result = match_against in markup
+ if markup is None:
+ result = len(match_against.items()) == 0
+ else:
+ result = match_against in markup
elif match_against and isinstance(markup, basestring):
match_against = markup.__class__(match_against)