* emacs/guix-list.el (guix-list-get-tabulated-entry): Call functions returning column value even for nil values. (guix-list-get-one-line): Adjust for accepting nil argument.
* emacs/guix-list.el (guix-list-get-tabulated-entry): Call functions returning column value even for nil values. (guix-list-get-one-line): Adjust for accepting nil argument.