"stgit rebase" should check for errors before changing tree

[Andrey Borzenkov <arvidjaar@xxxxxxx>]

{pts/0}% stg rebase 2.6.22-rc4
Checking for changes in the working directory... done
Popping all applied patches... done
Rebasing to "2.6.22-rc4"...
stg rebase: Unknown revision: 2.6.22-rc4^{commit}

well, now user is forced to reapply (push) all patches by hand, "stg rebase" 
lost history and state. It probably should check before popping patches.

stgit-0.12.1

-andrey

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