Subject: 25.0.50; sorting broken in tabulated-list-mode if SORT is nil in format spec

From: Mark Oteiza <[email-masked]>
Date: Tue, 06 Oct 2015 16:01:28 -0400

Hi,

In current master, if an spec in tabulated-list-format has SORT equal to
nil (meaning the column cannot be sorted), and one attempts to sort the
corresponding column, SORT (nil) is still used as a sorting
function. Hence, one gets the error (void-function nil) instead of the
previous behavior, which I believe was to remove any previous sorting.