Crash test update

[Caolán McNamara]

On Sat, 2021-06-12 at 10:18 +0000, crashtest wrote:
> New crashtest update available at  
> https://dev-builds.libreoffice.org/crashtest/b682c8c62b2bd6bd66b22c872a2b65b67892c1fa/

I see an assert with

soffice --headless --convert-to pdf fdo43054-1.odp
with a "TextColumns" property in

https://dev-builds.libreoffice.org/crashtest/b682c8c62b2bd6bd66b22c872a2b65b67892c1fa/backtraces/task908-core.backtrace.txt

which I'm guessing is triggered by something related to the recent
editengine-columns work