sh.zio.notify: handle extreme edge-case

usr/local/bin/sh.zio.backup

@@ -322,7 +322,11 @@ function print_time() {
     [[ $m != "0" ]] && output+=" $m $m_string"
     [[ $s != "0" ]] && output+=" $s $s_string"
 
-    echo $output
+	if [[ "$output" == "" ]]; then
+		echo "0 seconds"
+	else
+    	echo $output
+	fi
 }
 
 function start_service() {