handle payload serialization in the same way inside the catch

Author: ericallam

ailogger-output.log

@@ -916,7 +916,11 @@ export class BatchQueue {
           "BatchQueue.serializePayload",
           async (innerSpan) => {
             const str =
-              typeof item.payload === "string" ? item.payload : JSON.stringify(item.payload);
+              item.payload === undefined || item.payload === null
+                ? "{}"
+                : typeof item.payload === "string"
+                  ? item.payload
+                  : JSON.stringify(item.payload);
             innerSpan?.setAttribute("batch.payloadSize", str.length);
             return str;
           }