[MERGE][0.15] Better error on incompatible formats

[Aaron Bentley]

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John Arbash Meinel wrote:
> John Arbash Meinel has voted +1.
> Status is now: Approved
> Comment:
> I would be more comfortable with:
> 
> inter = InterRepository.get()
> try:
>   inter.fetch()
> except NotImplementedError:
>   raise Incompatibile...
> 
> So that we don't accidentally suppress something in the get() call.
> 
> I also think this would be reasonable for 0.15, since it is a very
> localized change. But that is up to Martin. (And maybe it should have a
> NEWS entry either way)

Happy to oblige.

Aaron
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