help me understand test_fetch_no_inventory_revision

[Robert Collins]

Hi Aaron, in revision 1910.2.40.1.1 you added a
test_interrepository.test_fetch_no_inventory_revision.

I'm not sure what this is meant to test; its being triggered by the
InterPack fetch optimiser, which fails currently. But I'm not sure why
its failing, and the monkey patching of deserialise_inventory seems
unrelated to what the optimisers do (any native format optimiser is
unlikely to deserialise the full inventory ...)

I'm going to track down why it fails, but it sure would help me have a
quick note on what its trying to test, any why the monkey patching is
needed.

-Rob
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