fdo#73695 prevent use of invalidated iterator due to re-entrance

... through the UNO backdoor..
While charts are updated there can be chart data listeners in BASIC that
in turn modify things such that charts are inserted/removed from the
listener chain, invalidating the iterator. If that happens break and
bail out instead of crashing. Not ideal, but..

Change-Id: Iefb33d3a96d79caed0ee4e19b73e8f811ef3d937

sc/source/core/tool/chartlis.cxx

@@ -619,8 +619,8 @@ void ScChartListenerCollection::UpdateDirtyCharts()
 
         if (meModifiedDuringUpdate == SC_CLCUPDATE_MODIFIED)
             break;      // iterator is invalid
-        
-	if (aIdle.IsActive() && !pDoc->IsImportingXML())
+
+        if (aIdle.IsActive() && !pDoc->IsImportingXML())
             break;                      // one interfered
     }
     meModifiedDuringUpdate = SC_CLCUPDATE_NONE;