[MERGE][1.5][bug #211661] Don't try to send None to get_parent_map()

[John Arbash Meinel]

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Ian Clatworthy wrote:
| John Arbash Meinel wrote:
|> It turns out there was another code path I missed, and this patch
|> includes test
|> cases for all repository implementations. (So all repositories refuse to
|> allow
|> get_parent_map([None]), whether they are local or remote.)
|
| bb:approve
|
| Ian C.
|

I wish I had pushed on this more, as obviously 1.5 went out the door without
this bug fix. Anyway, I'll submit it now, and update to indicate it is in 1.6
not 1.5...

Thanks for the review.

John
=:->
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