broadcaster cells are empty, fdo#54553

Change-Id: Ie7c251b7eaee248c97f4f931175bc26539acb22a

sc/source/core/data/cell.cxx

@@ -264,6 +264,9 @@ void ScBaseCell::Delete()
 
 bool ScBaseCell::IsBlank() const
 {
+    if(eCellType == CELLTYPE_NOTE)
+        return true;
+
     return false;
 }