guard against missing geometry

Change-Id: I6b2945f1d5a1654f6b5d6a5f5287b4cb9514d97c
(cherry picked from commit d4d24786)
(cherry picked from commit 6a9f9191)
Reviewed-on: https://gerrit.libreoffice.org/20596Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>

lotuswordpro/source/filter/lwplayout.cxx

@@ -1044,10 +1044,10 @@ sal_Int32 LwpMiddleLayout::DetermineWidth()
     {
         assert(false);
     }
-    else
+    else if (LwpLayoutGeometry* pGeo = GetGeometry())
     {
         m_nAttributes3 |= STYLE3_WIDTHVALID;
-        return GetGeometry()->GetWidth();
+        return pGeo->GetWidth();
     }
     return 0;
 }