related to tdf#87437: prevent null pointer function call

Fix for change id  Ia98017cbba7d3a43b67764ae0fa6447b7e90ca86

Change-Id: Iad3d689f7a8dd612c31ea80c9502031a2dc0ed70
Reviewed-on: https://gerrit.libreoffice.org/17391Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/filter/ww8/wrtw8nds.cxx

@@ -2123,7 +2123,7 @@ void MSWordExportBase::OutputTextNode( const SwTextNode& rNode )
     if ( pTextNodeInfo.get() != NULL )
     {
         pTextNodeInfoInner = pTextNodeInfo->getFirstInner();
-        if ( pTextNodeInfoInner->isEndOfCell() ) {
+        if ( pTextNodeInfoInner && pTextNodeInfoInner->isEndOfCell() ) {
             bIsEndOfCell = true;
         }
     }