[MERGE][#295161] Ensure valid messages and revision properties

[Jelmer Vernooij]

Jelmer Vernooij has voted approve.
Status is now: Approved


For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C491BC2DF.6080606%40arbash-meinel.com%3E
Project: Bazaar