if wms advertises a layer not to be queryable, terriajs should not query it

[pvgenuchten]

I noticed that terriajs fires getfeatureinfo requests to a wms service even if the capabilities of the service indicates a layer not to be queryable, see for example

https://maps.isric.org/mapserv?map=%2Fmap%2Fwosis_latest.map&service=WMS&request=GetCapabilities

layers in this service are not queryable

but terria does fire gfi requests, which result in a service exception (layer not available)

Nice to have: a GUI element indicating to the user that the layer is not queryable