volume-pipewire: use default sink if inactive

If all of the sinks are inactive, fall back to the default sink instead
of saying "audio inactive". This allows changing the volume while no
audio is playing.

volume-pipewire/volume-pipewire

@@ -119,7 +119,11 @@ function print_format {
 }
 
 function print_block {
-    ACTIVE=$(pactl list sinks  | grep "State\: RUNNING" -B4 -A55 | grep "Name:\|Volume: \(front-left\|mono\)\|Mute:\|api.alsa.pcm.card = \|node.nick = ")
+    ACTIVE="$(pactl list sinks  | grep "State\: RUNNING" -B4 -A55)"
+    if [[ $ACTIVE = "" ]] ; then
+        ACTIVE="$(pactl list sinks | grep "$(pactl get-default-sink)" -B4 -A55)"
+    fi
+    ACTIVE="$(echo "$ACTIVE" | grep "Name:\|Volume: \(front-left\|mono\)\|Mute:\|api.alsa.pcm.card = \|node.nick = ")"
     for Name in NAME MUTED VOL INDEX NICK; do
         read $Name
     done < <(echo "$ACTIVE")