add on-click event to refresh the update counter

templates/.config/waybar/config.jsonc.j2

@@ -45,6 +45,7 @@
         "return-type": "json",
         // every 7 hours
         "interval": 25200,
+        "on-click": "",
     },
     
 {% for iface in host.wireless %}

templates/bin/waybar-void-update-checker

@@ -3,9 +3,9 @@
 set -e
 
 info="$(xbps-install -Mun)"
+[ -z $info ] && exit
 
-PKG_COUNT="$(echo "$info" | wc -l)"
-[ $PKG_COUNT -eq 0 ] && exit
+PKG_COUNT="$(echo -n "$info" | wc -l)"
 
 DL_SIZE="$(echo "$info" | awk '{s+=$6}END{print s}' | numfmt --to=iec-i)B"