[multimedia] j-p-s: fix typo, add a tip, symlink

Fix a dumb typo in just-play-something.sh, improve the README with a
new tip, and add a symbolic link in the bin/ directory.

bin/just-play-something

@@ -0,0 +1 @@
+../multimedia/just-play-something.sh

multimedia/README

@@ -28,10 +28,14 @@ What this script will do for you:
   your library and play it;
 - if music is already playing, it will be paused.
 
-Tip: you can bind a short button press to just-play-something, and a
-long press (or another button) to mpc clear && just-play-something, so
-that if you don't like what is currently in the playlist, you can force
-playing a random album with a long press.
+Tips:
+- You can bind a short button press to 'just-play-something', and a long
+  press (or another button) to 'mpc clear ; just-play-something', so
+  that if you don't like what is currently in the playlist, you can
+  force playing a random album with a long press.
+- Running this script from another host works just fine by setting the
+  MPD_HOST variable (and possibly MPD_PORT), for example:
+    MPD_HOST=192.168.0.254 just-play-something
 
 
 # metflac-field2field.sh #

multimedia/just-play-something.sh

@@ -31,7 +31,7 @@ if ! mpc >/dev/null 2>&1 ; then
 fi
 
 # If the playlist is empty, add a random album to the playlist
-if [ "$(mpc playlist 2>/devlnull)" = "" ] ; then
+if [ "$(mpc playlist 2>/dev/null)" = "" ] ; then
   NB_ALBUMS=`mpc list Album | wc -l`
   RAND_ALBUM_NUM=`random $NB_ALBUMS`
   RANDOM_ALBUM=`mpc list Album | sed -n ${RAND_ALBUM_NUM}p`