Split member and nonmember moderation.

 * member-moderation happens at the same place in the built-in chain that the
   previously named moderation rule happens.  nonmember-moderation happens
   after all the other normal moderation rules.
 * Handle unsubscribed nonmember posts.

Other changes:

 * Message.senders now filters out Nones and empty strings.
 * Various test cleanups and simplifications.
 * More `address` -> `email` fixes.
 * Give Link class a useful repr.
 * Fix a potential UnboundLocalError.
 * Various other small changes.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/mailman/tests/test_documentation.py b/src/mailman/tests/test_documentation.py
index eac06e1cf..30bcdccc3 100644
--- a/src/mailman/tests/test_documentation.py
+++ b/src/mailman/tests/test_documentation.py
@@ -99,6 +99,9 @@ def stop():
 
 def dump_msgdata(msgdata, *additional_skips):
     """Dump in a more readable way a message metadata dictionary."""
+    if len(msgdata) == 0:
+        print '*Empty*'
+        return
     skips = set(additional_skips)
     # Some stuff we always want to skip, because their values will always be
     # variable data.