Fix for Field filter. It did not work on a custom field that has the type country.

CHANGELOG.md

 # Version 1.17 (not yet released)
 
+* Fix for Field filter. It did not work on a custom field that has the type country.
+
 # Version 1.16
 
 * Fixed blank worldregion in CVS output #52

Civi/DataProcessor/DataSpecification/CustomFieldSpecification.php

@@ -51,6 +51,9 @@ class CustomFieldSpecification extends FieldSpecification {
     if ($this->type == 'Boolean') {
       return false;
     }
+    if ($this->type == 'Country') {
+      return false;
+    }
     if ($this->customField['html_type'] == 'Radio' && empty($this->customField['serialize'])) {
       return false;
     }