update-remote-product doesn't handle AssertionErrors; Bugzilla raises them

[Graham Binns]

We've added some limited error handling for update-remote-product.py to stop it from choking every time an ExternalBugTracker throws an exception. Unfortunately, this was based around EBT's only raising BugWatchUpdateErrors or BugWatchUpdateWarnings (which is what they should be raising). However, some legacy code in the Bugzilla EBT class uses asserts for validation; u-r-p can't handle the AssertionErrors and breaks when it comes across them.

[Björn Tillenius (bjornt)]

Fixed in db r7763.