[MERGE] don't report malformed bundles as NotABundle

[Aaron Bentley]

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John Arbash Meinel wrote:
> 
> I don't think 'assertNotRaises' is really what we want.
> I think we want a fixed exception to be raised (MalformedBundle).

I think it's a bug in our implementation that crlf bundle cause
MalformedBundle to be raised.

> As far
> as the "doesn't raise anything" case, that is already handled by *not*
> catching the exception at all.

If we say 'assertRaises', it's a failure if it doesn't raise.

Aaron
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