fixed empty controlFlowStorageCustomNode append

src/node-transformers/node-control-flow-transformers/FunctionControlFlowTransformer.ts

@@ -87,6 +87,10 @@ export class FunctionControlFlowTransformer extends AbstractNodeTransformer {
             }
         });
 
+        if (!controlFlowStorage.getLength()) {
+            return;
+        }
+
         const controlFlowStorageCustomNode: ICustomNode = new ControlFlowStorageNode(
             controlFlowStorage,
             controlFlowStorageCustomNodeName,