guard against null Foundry

Change-Id: I8aabc68e8dfb9376cafe4cc709b18344da083a01
(cherry picked from commit 2f0fba49)
(cherry picked from commit 51a1b41a)
Reviewed-on: https://gerrit.libreoffice.org/20755Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: David Tardon <dtardon@redhat.com>
(cherry picked from commit f1c1380c)

lotuswordpro/source/filter/lwpfrib.cxx

@@ -250,14 +250,14 @@ void LwpFrib::RegisterStyle(LwpFoundry* pFoundry)
     m_StyleName.clear();
     XFStyleManager* pXFStyleManager = LwpGlobalMgr::GetInstance()->GetXFStyleManager();
     XFTextStyle* pNamedStyle = nullptr;
-    if (m_pModifiers->HasCharStyle)
+    if (m_pModifiers->HasCharStyle && pFoundry)
     {
         pNamedStyle = static_cast<XFTextStyle*>
                                 (pFoundry->GetStyleManager()->GetStyle(m_pModifiers->CharStyleID));
     }
     if (pNamedStyle)
     {
-        if (m_pModifiers->FontID)
+        if (m_pModifiers->FontID && pFoundry)
         {
             pStyle = new XFTextStyle();
             *pStyle = *pNamedStyle;
@@ -277,7 +277,7 @@ void LwpFrib::RegisterStyle(LwpFoundry* pFoundry)
     }
     else
     {
-        if (m_pModifiers->FontID)
+        if (m_pModifiers->FontID && pFoundry)
         {
             pStyle = new XFTextStyle();
             pFont = pFoundry->GetFontManger().CreateFont(m_pModifiers->FontID);