Description

Empty CQL_FILTER is sent in the FeatureInfo request when using sources with proxy.
This causes an error on server and so an error message shown on FeatureInfo shown.

In case of Bug (otherwise remove this paragraph)

Browser Affected
any

Steps to reproduce

• Login as admin
• Add a catalog that is not available in cors white list . For instance this: http://cloudsdi.geo-solutions.it/geoserver/wms
• add a layer to the map from this catalog
• Click on Map to get a GFI

Expected Result

• See feature info

Current Result

• See an error in feature info

Details

This happens only on proxy because of this issue: #3144 . Anyway is correct to do not pass additional parameters if they are not necessary.