ofz#14086 another batch of oss-fuzz failures

since...

commit 7282014e
Date:   Fri Feb 1 15:15:16 2019 +0100

    tdf#50916 Makes numbers of columns dynamic.

Change-Id: Ib4f39c03aadc41fb2a226f47e452fd66b9b34821
Reviewed-on: https://gerrit.libreoffice.org/70387
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/core/data/table2.cxx

@@ -1493,7 +1493,7 @@ ScFormulaCell* ScTable::SetFormulaCell( SCCOL nCol, SCROW nRow, ScFormulaCell* p
         return nullptr;
     }
 
-    return aCol[nCol].SetFormulaCell(nRow, pCell, sc::ConvertToGroupListening);
+    return CreateColumnIfNotExists(nCol).SetFormulaCell(nRow, pCell, sc::ConvertToGroupListening);
 }
 
 bool ScTable::SetFormulaCells( SCCOL nCol, SCROW nRow, std::vector<ScFormulaCell*>& rCells )