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-rw-r--r--django/test/testcases.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/test/testcases.py b/django/test/testcases.py
index a9a432fa21..8a85aa2a9f 100644
--- a/django/test/testcases.py
+++ b/django/test/testcases.py
@@ -429,7 +429,7 @@ class SimpleTestCase(unittest.TestCase):
msg_prefix + "The form '%s' in context %d does not"
" contain the non-field error '%s'"
" (actual errors: %s)" %
- (form, i, err, non_field_errors)
+ (form, i, err, non_field_errors or 'none')
)
if not found_form:
self.fail(msg_prefix + "The form '%s' was not used to render the response" % form)