A query with no search fields throws an error when searching

[cskeefer]

If you define a query with no search fields (basically would just let you look through all the data) and then search using it, you get an error.

To recreate:

• Create a new query
• Select one or more fields to be Results Only
• Save it
• From the Search page, specify your query and confirm that there are no search fields on the left
• Type something in the search text box at the top and click the Search! button
• An error message is displayed saying: "Server Error, please make sure you didn't change the inputs"

We could require that at least one search parameter be specified when creating a query but that would prevent the use case of being able to page through the data without a query.