Committing incomplete directories

A user reported an assertion failure in 1.7:

http://subversion.tigris.org/issues/show_bug.cgi?id=4042

caused by committing a property change on a presence=incomplete
directory. It's not possible to prevent property modifications on
incomplete directories, since the modification could be made before the
directory becomes incomplete.

In 1.6 such a commit was allowed and, provided the server accepted the
commit, the directory remained incomplete in the working copy.

Should we support that in 1.7? Or should we simply have the client
refuse to commit incomplete nodes. Most incomplete nodes occur after an
interrupted update, but wc could have incomplete working nodes resulting
from a wc-wc copy.

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