guard against missing SuperTable

Change-Id: Ic7cc6c807905e0c4ffbf2a3f009b27be6100cdf0
diff --git a/lotuswordpro/source/filter/lwpfribtable.cxx b/lotuswordpro/source/filter/lwpfribtable.cxx
index 9c93c26..7833ae4 100644
--- a/lotuswordpro/source/filter/lwpfribtable.cxx
+++ b/lotuswordpro/source/filter/lwpfribtable.cxx
@@ -77,7 +77,9 @@ LwpSuperTableLayout* LwpFribTable::GetSuperTable()

void LwpFribTable::RegisterNewStyle()
{
    GetSuperTable()->RegisterNewStyle();
    LwpSuperTableLayout* pSuper = GetSuperTable();
    if (pSuper)
        pSuper->RegisterNewStyle();
    XFParaStyle* pOldStyle = m_pPara->GetXFParaStyle();
    if(HasNextFrib())
    {