Issue Summary

This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Create a dashboard and a gadget with a Filter Results type, save and load.
2. Once the issues load, click in a column to sort by a custom field (that later, you need to delete).
   
3. Delete the custom field, and in the gadget, click to refresh/reload.
   
4. It will be shown as the above image.
5. At network log, it will show an Error, and at Splunk, will show as follows

   Invalid JQL: Not able to sort using field 'cf[10123]'.

Expected Results

Once a custom field is deleted, its references should be removed from gadgets.

Actual Results

It shows the message "No matching issues found," which is misleading since the filter loads fine; only the gadget is broken.

Workaround

Edit the gadget, change the filter to another, then change back to the original, and save it.