Add compatibility with old versions of playerctl
Add compatibility with old versions of playerctl

playerctl version 2.0.0 rc1 changed the message when no players are found.

See-also: https://github.com/altdesktop/playerctl/commit/ee50b0da927ac6b33fb84f75c9acd35b40c23d0d

hoyon/mpv-mpris,hoyon/mpv-mpris