since ad8261d (rebase: use reflog to find common base with upstream)
a rebase without arguments says "fatal: Not a valid object name: ''",
caused by trying to determine the fork point with an empty $switch_to.
I don't really see what the appropriate fix would be. :-(
"Totally trivial. Famous last words."
From: Linus Torvalds <torvalds@*.org>
Date: Fri, 22 Jan 2010 07:29:21 -0800
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