[MERGE] dont stacktrace on bad plugin versions

[Marius Kruger]

Hi,

For background I did:
$ bzr branches bzr+https://me@someserver/bzr/myrepo/
poc/EBRClientPrototype.dev

which worked fine. then
$ bzr branches bzr+https://me@someserver/bzr/

threw a stack trace, but when it tries to make a message with all the plugin
versions
for the user to be able to report a bug, it trows another exception :(

It turns out that one of my plugins (xmloutput) has a non-standard version
number:
version_info = (0, 9, 0, 'dev')
which looks fine if you dont know better.

I could not find any place in the documentation which specifies what this
version
number should contain, so I added a little something.

I also thought that it'll be much nicer of us to rather format whatever is
in there
in stead of throwing our toys out of the cot.

regards
marius
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