Issue #3254978 by joachim: Fixed radios values not saving in component form.

src/Form/ComponentSectionForm.php

@@ -1107,7 +1107,9 @@ class ComponentSectionForm extends ComponentFormBase {
         elseif (!is_numeric($key) && $data->{$key}->hasOptions() && !$data->{$key}->isRequired()) {
           // Options elements that are not required should be cleaned up, so we
           // don't set an empty string as the data value.
-          unset($array[$key]);
+          if ($value == '' || $value == NULL) {
+            unset($array[$key]);
+          }
         }
       }
     }