fix: Show error when referencing node that exist but has not been executed (#6496)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/workflow/src/WorkflowDataProxy.ts

@@ -943,6 +943,10 @@ export class WorkflowDataProxy {
 					throw createExpressionError(`"${nodeName}" node doesn't exist`);
 				}
 
+				if (!that?.runExecutionData?.resultData?.runData.hasOwnProperty(nodeName)) {
+					throw createExpressionError(`no data, execute "${nodeName}" node first`);
+				}
+
 				return new Proxy(
 					{},
 					{