return early if Container invalidated

Change-Id: I3983070f1fe447e4b75b956cf95d3b3c5266b3f9
diff --git a/lotuswordpro/source/filter/lwppara.cxx b/lotuswordpro/source/filter/lwppara.cxx
index 7cd676c..65784f1 100644
--- a/lotuswordpro/source/filter/lwppara.cxx
+++ b/lotuswordpro/source/filter/lwppara.cxx
@@ -247,6 +247,8 @@ void LwpPara::Parse(IXFStream* pOutputStream)
{
    m_pXFContainer = new XFContentContainer;
    XFConvert(m_pXFContainer);
    if (!m_pXFContainer)
        return;
    m_pXFContainer->ToXml(pOutputStream);
    m_pXFContainer->Reset();
    delete m_pXFContainer;