[MERGE][Bug #196618] Change some assertions to exceptions in LP plugin

[Daniel Mark Watkins]

Attached is a patch which changes the assertion that was the issue in
bug #196618[0] to raise an exception so the user gets a prettier error
message.  There was another obvious assertion which got drive-by
treatment.


Dan

[Footnote 0: https://bugs.launchpad.net/bzr/+bug/196618]
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