Michele Ballabio writes:

quoted text
> This patch indroduces a check before unsetting an array element.

introduces

quoted text
> There's an error that seems to occur in gitk only on
> mutt's imported repo, but I don't know why. This is
> hopefully the right fix.

Well no.  I'd rather understand why this is happening, in case the
error indicates that I'm not handling a corner case correctly.  Can
you make a copy of the repo that triggers the bug available to me?

Paul.
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