Re: master ca47390: image-dired: Report when a necessary executable is not found

[Glenn Morris]

Hi,


Tino Calancha wrote:

>  (defcustom image-dired-cmd-create-thumbnail-program
> -  "convert"
> +  (executable-find "convert")
>    "Executable used to create thumbnail.
>  Used together with `image-dired-cmd-create-thumbnail-options'."
>    :type 'string

Please update this and all the other affected :types to allow for the
nil values that may now occur. You might also want to document what a
value of nil means. Thanks.