refactor(waybar): do not return package updates if none are available

dots/.config/waybar/scripts/get-pacman-package-updates.bash

@@ -9,9 +9,11 @@ main() {
 	if ((package_update_number > 10)); then
 		package_updates="$(printf "%s" "${package_updates}" | head -n 10)"
 		package_updates+="\n..."
+	elif (( package_update_number == 0 )); then
+		# Don't return anything if there are no updates available
+		return 0
 	fi
 
-
 	printf '{"text": "%s", "tooltip": "%s"}\n' "${package_update_number}" "${package_updates//$'\n'/\\n}"
 }