4000 Initialize missing metadata map for cluster elements

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ivicac

server/libs/platform/platform-configuration/platform-configuration-service/src/main/java/com/bytechef/platform/configuration/facade/WorkflowNodeParameterFacadeImpl.java

@@ -1133,6 +1133,12 @@ private Map<String, Object> getMetadataMap(
                     clusterElementTypeName, clusterElementWorkflowNodeName, taskMap);
 
                 metadataMap = (Map<String, Object>) clusterElementMap.get(METADATA);
+
+                if (metadataMap == null) {
+                    metadataMap = new HashMap<>();
+
+                    ((Map<String, Object>) clusterElementMap).put(METADATA, metadataMap);
+                }
             }
         } else {
             metadataMap = (Map<String, Object>) triggerMap.get(METADATA);