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

[Aaron Bentley]

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Mark Hammond wrote:
> This is fairly trivial, but bzrlib._format_version_tuple() raises an
> unintended exception when passed an invalid version tuple (so I'm reusing
> that function even though it has an underscore - sue me ;)

Since you admit that you're using a private function in an extension,
you should propose turning it into a public function.

Aaron
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