No query for hidden layer

[yhy0217]

Closes #904

[prushforth]

Likely not related to the hidden layer problem, but the query that gets executed indicates that there are two features being returned, but there is only one in fact. The actually query link template is a bit fake in this example, because it is hard-coded to return the legend graphic from each of the datacube layers as an entry in a table in a map-feature's map-properties. That's probably what it is counting as two features tbd.