Some follow-up to r3092 and r3094 for the TracChangeset ''diff'' format (either old_node or new_node could be None) and ''zip'' format (better comment)
Some follow-up to r3092 and r3094 for the TracChangeset ''diff'' format (either old_node or new_node could be None) and ''zip'' format (better comment)

git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@3096 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac