Crash test update

[Caolán McNamara]

On Tue, 2018-11-27 at 11:35 +0000, Crashtest VM wrote:
> New crashtest update available at 
> http://dev-builds.libreoffice.org/crashtest/7fcdc7efe836f9ca71f80d3178a2578b63fb3fd8/

last two or three of the export failures are assert from...

commit 6eebecf39a9e634cccad50ede29d281a6bfd24c8
Date:   Fri Oct 19 15:46:27 2018 +0200

    sw_redlinehide_3: apparently a live SwNodeNum always has a parent
    
    ... so assert that somewhere.