Ticket #19799: fix2.patch

django/contrib/auth/hashers.py

@@ -83 +83 @@
         except (AttributeError, ImportError, ValueError):
             raise ImproperlyConfigured("hasher not found: %s" % backend)
         hasher = hasher_cls()
-        if not getattr(hasher, 'algorithm'):
+        if getattr(hasher, 'algorithm', None) is None:
             raise ImproperlyConfigured("hasher doesn't specify an "
                                        "algorithm name: %s" % backend)
         hashers.append(hasher)