[atlas] map distinction between "no data yet" and "timeout"

I was just trying to get a map view for a nameserver that appeared to not be responding to people in some geographical areas. I fired off a measurement across a load of probes and get a map back. In my particular case, the result I'm looking for is whether a response came back from the target server at all. But the map doesn't distinguish between probes that haven't measured yet, and probes that have attempted a measurement but timed out, as far as I can tell. --