tdf#104181 related: don't throw on this document

Change-Id: I53abf3267e1a75e944de82222c6ea80a72de0e7e
Reviewed-on: https://gerrit.libreoffice.org/33245
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>
diff --git a/sw/source/core/layout/flowfrm.cxx b/sw/source/core/layout/flowfrm.cxx
index ffa8168..6b831da 100644
--- a/sw/source/core/layout/flowfrm.cxx
+++ b/sw/source/core/layout/flowfrm.cxx
@@ -1800,6 +1800,9 @@ bool SwFlowFrame::MoveFwd( bool bMakePage, bool bPageBreak, bool bMoveAlways )
{
//!!!!MoveFootnoteCntFwd might need to be updated as well.
    SwFootnoteBossFrame *pOldBoss = m_rThis.FindFootnoteBossFrame();
    assert(pOldBoss);
    if (!pOldBoss)
        return false;
    if (m_rThis.IsInFootnote())
    {
        if (!m_rThis.IsContentFrame())