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-rw-r--r--src/mailman/tests/test_documentation.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mailman/tests/test_documentation.py b/src/mailman/tests/test_documentation.py
index f89979ba2..a8157a18f 100644
--- a/src/mailman/tests/test_documentation.py
+++ b/src/mailman/tests/test_documentation.py
@@ -110,7 +110,7 @@ def dump_msgdata(msgdata, *additional_skips):
print '{0:{2}}: {1}'.format(key, msgdata[key], longest)
-def dump_list(list_of_things, key=None):
+def dump_list(list_of_things, key=str):
"""Print items in a string to get rid of stupid u'' prefixes."""
# List of things may be a generator.
list_of_things = list(list_of_things)