[MERGE][Trivial] invalid version tuple attempt to raise AssertionError fails with TypeError

[Aaron Bentley]

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Mark Hammond wrote:
> bzrtools:
> 
>  from bzrlib import revision as _mod_revision

That is not an example of importing a private symbol.

>  from bzrlib.diff import _patch_header_date  (in a test)

I guess I'm more comfortable with using private methods in tests, since
the worst that can happen is a spurious test failure.  But maybe we
shouldn't allow even that.

Anyhow, we want to provide a great API, and if you have to use a private
symbol, we're failing at that.  Please help us make our API great.

Aaron
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