guard against missing Foundry

Change-Id: I9147dc2bab312639a04d2e822cf99745d38d3b8d
(cherry picked from commit 22ee3194)
Reviewed-on: https://gerrit.libreoffice.org/20574Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

lotuswordpro/source/filter/lwppagelayout.cxx

@@ -267,8 +267,8 @@ void LwpPageLayout::ParseBackColor(XFPageMaster* pm1)
 void LwpPageLayout::ParseFootNoteSeparator(XFPageMaster * pm1)
 {
     //Get the footnoteoptions for the root document
-    LwpDocument* pDocument = m_pFoundry->GetDocument();
-    if(pDocument)
+    LwpDocument* pDocument = m_pFoundry ? m_pFoundry->GetDocument() : nullptr;
+    if (pDocument)
     {
         LwpObjectID* pFontnodeId = pDocument->GetValidFootnoteOpts();