Unknown locationId in Campaign Location Target Report

[mm]

Hey guys -
I'm pulling a Campaign Location Target Report for an account and I'm seeing multiple rows returned with "--" as the locationId. I only see this when I request metrics - if I pull a 0-impression report, these rows don't show up.
 
How should that be interpreted?
 
Thanks!
mm

[Josh Radcliff (AdWords API Team)]

Hi mm,

I suspect that what's happening is that the rows with -- for the Id field are for impressions where no location data was available. Could you share some campaign IDs and date ranges so I can confirm?

Thanks,

Josh, AdWords API Team