If the location is invalid (for example, address is "ggg"), the app should prompt for a valid location rather than asking if the device is online

[dektar]

For example, an onErrorResponse to a location request should prompt for a new location.

To do this properly we'd need a location API on the app (see #59). I wonder, @nickoneill , whether the API could return an "invalid address" response or something helpful?

[dektar]

I think I can look for a 400 error which seems to indicate the same (instead of the type of response that comes from being offline)