tdf#105236, only take number format from numeric cells

Change-Id: I55deaa1f0579582a45dc1e10bb578b680eb98647
Reviewed-on: https://gerrit.libreoffice.org/64200
Tested-by: Jenkins
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
(cherry picked from commit fb04e718)
Reviewed-on: https://gerrit.libreoffice.org/64203

sc/source/ui/unoobj/chart2uno.cxx

@@ -3145,7 +3145,7 @@ sal_uInt32 getDisplayNumberFormat(const ScDocument* pDoc, const ScAddress& rPos)
         for (const Item& rItem : m_aDataArray)
         {
             ScRefCellValue aCell(*m_pDocument, rItem.mAddress);
-            if (!aCell.isEmpty())
+            if (!aCell.isEmpty() && aCell.hasNumeric())
             {
                 return static_cast<sal_Int32>(getDisplayNumberFormat(m_pDocument, rItem.mAddress));
             }