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−From: Andrey Vlasovskikh <andrey.vlasovskikh@gmail.com>
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−Date: Mon, 08 Mar 2010 01:23:25 +0300
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−State: new
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−Subject: KeyError while accessing an empty Maildir
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−Message-Id: <cf0d1e2ca226848d-0-artemis@vlan-laptop>
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−
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−If a Maildir contains no message files, `hg ilist` raises the following
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−exception:
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−
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−    KeyError: 'No message with key: None'
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−
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−This can happen if one updates his repository to an early revision where there
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−was less issues than it is now. Mercurial doesn't delete empty directories, so
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−an issue from the future is represented a Maildir with no messages.
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−
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−The problem is in handling the result of `_find_root_key`, which will be `None`
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−in that case.
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−