Issue #3509428: Introduce php match expression - revert

src/Element/WorkflowTransitionElement.php

@@ -162,7 +162,7 @@ class WorkflowTransitionElement extends FormElement {
 
       default:
         // We are in trouble! A message is already set in workflow_node_current_state().
-        $current_sid = '';
+        $current_sid = 0;
         $show_widget = FALSE;
         $default_value = FALSE;
         break;