Re: master a7c65fc666: Allow nil value for filter-buffer-substring-function

[Stefan Kangas]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> As I said, it breaks `add-function`.  If the var's value is nil
>
>     (add-function :before filter-buffer-substring-function #'ignore)
>
> will lead to errors, even though it should be harmless (as well as
> useless, of course).

OK, I'll revert the change.