Hide IPv6 when unavailable

Install/Templates/i3status/config

@@ -21,6 +21,11 @@ order += "volume master"
 order += "battery 0"
 order += "tztime local"
 
+ipv6 {
+	format_up = "%ip"
+	format_down = ""
+}
+
 wireless _first_ {
         format_up = "⌔ %essid%quality %bitrate %ip"
         format_down = "⌔×"