search update

lib/pages/receiving/receiving_editor.dart

@@ -231,6 +231,11 @@ class _ReceivingEditorState extends State<ReceivingEditor> {
       showMsgDialog(context, "Error", "Invalid tracking ID!");
       return;
     }
+
+    if (user == null) {
+      showMsgDialog(context, "Error", "Please select FCS ID");
+      return;
+    }
     setState(() {
       _isLoading = true;
     });