Return host on ip convertion error (#57)

This works around issue #46.

Signed-off-by: Anton Lundin <glance@acc.umu.se>

Author: glance-

netdisco/discoverables/__init__.py

@@ -105,7 +105,10 @@ def ip_from_host(self, host):
         """
         ips = self.netdis.mdns.zeroconf.cache.entries_with_name(host.lower())
 
-        return repr(ips[0]) if ips else host
+        try:
+            return repr(ips[0]) if ips else host
+        except TypeError:
+            return host
 
 
 class GDMDiscoverable(BaseDiscoverable):