Related: fdo#73608 don't crash on missing table styles

Change-Id: I340b43b7afc4c5c4d6dc8e4ed182279240306540

writerfilter/source/dmapper/DomainMapperTableHandler.cxx

@@ -83,6 +83,10 @@ void DomainMapperTableHandler::startTable(unsigned int nRows,
 PropertyMapPtr lcl_SearchParentStyleSheetAndMergeProperties(const StyleSheetEntryPtr pStyleSheet, StyleSheetTablePtr pStyleSheetTable)
 {
     PropertyMapPtr pRet;
+
+    if (!pStyleSheet)
+        return pRet;
+
     if(!pStyleSheet->sBaseStyleIdentifier.isEmpty())
     {
         const StyleSheetEntryPtr pParentStyleSheet = pStyleSheetTable->FindStyleSheetByISTD( pStyleSheet->sBaseStyleIdentifier );
@@ -93,7 +97,10 @@ PropertyMapPtr lcl_SearchParentStyleSheetAndMergeProperties(const StyleSheetEntr
         pRet.reset( new PropertyMap );
     }
 
-    pRet->InsertProps(pStyleSheet->pProperties);
+    if (pRet)
+    {
+        pRet->InsertProps(pStyleSheet->pProperties);
+    }
 
     return pRet;
 }
@@ -254,6 +261,9 @@ namespace
 
 bool lcl_extractTableBorderProperty(PropertyMapPtr pTableProperties, const PropertyIds nId, TableInfo& rInfo, table::BorderLine2& rLine)
 {
+    if (!pTableProperties)
+        return false;
+
     const boost::optional<PropertyMap::Property> aTblBorder = pTableProperties->getProperty(nId);
     if( aTblBorder )
     {