Merge pull request #20600 from ixiam/dev#SettingsTraitCheckboxes

Force cleanup of setting value type "checkboxes" when is empty

CRM/Admin/Form/SettingTrait.php

@@ -85,9 +85,13 @@ trait CRM_Admin_Form_SettingTrait {
     // Handle quickform hateability just once, right here right now.
     $unsetValues = array_diff_key($this->_settings, $params);
     foreach ($unsetValues as $key => $unsetValue) {
-      if ($this->getQuickFormType($this->getSettingMetadata($key)) === 'CheckBox') {
+      $quickFormType = $this->getQuickFormType($this->getSettingMetadata($key));
+      if ($quickFormType === 'CheckBox') {
         $setValues[$key] = [$key => 0];
       }
+      elseif ($quickFormType === 'CheckBoxes') {
+        $setValues[$key] = [];
+      }
     }
     return $setValues;
   }