fix(radiosfield, selectfield): check default value before save

if the value is invalid (not in the list of possible values), an error will occur

Author: btry

inc/field/radiosfield.class.php

@@ -121,6 +121,15 @@ public function prepareQuestionInputForSave($input) {
       $input['values'] = $this->trimValue($input['values']);
       $input['default_values'] = trim($input['default_values']);
 
+      if (!$this->isValidValue($input['default_values'])) {
+         Session::addMessageAfterRedirect(
+            __('The default value is invalid:', 'formcreator') . ' ' . $input['name'],
+            false,
+            ERROR
+         );
+         return [];
+      }
+
       return $input;
    }