[merge][#240161] short error for missing libraries

[Robert Collins]

On Tue, 2008-06-17 at 11:15 +1000, Martin Pool wrote:
> A few people have reported recently being confused by getting a
> traceback for missing python libraries.  This changes an ImportError
> for that specific case into a short message.

I would have thought self.assertRaises would be the usual way to check
something is raised :).

Could you note why its not used?

Other than that
bb:approve

-Rob
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