tdf#97960 - .doc: preserve font size in empty cells

fixes regression from commit e1b12389.

Change-Id: Iccc10cdba89cdae6a5618d29022e0eaf609c9d6f
Reviewed-on: https://gerrit.libreoffice.org/22759Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>

sw/source/filter/ww8/wrtw8nds.cxx

@@ -2334,7 +2334,7 @@ void MSWordExportBase::OutputTextNode( const SwTextNode& rNode )
 
                     WriteCR( pTextNodeInfoInner );
 
-                    if ( bIsEndOfCell )
+                    if ( (0 != nEnd) && bIsEndOfCell )
                     {
                         AttrOutput().OutputFKP(true);
                     }