Crash test update

[Noel Grandin]

On 2019/04/27 5:33 PM, Caolán McNamara wrote:
> --headless --convert-to pdf tdf89833-2.xlsm
> semi-reliably fails stl concept checking "Error: attempt to compare a
> dereferenceable iterator to a singular iterator"
> I imagine this started with some part of the tdf#81765 fixes
> 

fix in progress here:

     https://gerrit.libreoffice.org/71677

had to revert my perf improvement, sigh.