Merge branch 'fix-buggy-commit-parsing-dates' into 'master'

Fix previous commit which broke date parsing & palette creation

Hello,

I fixed the previous commit (a73852cb), which was maybe pushed a little bit too fast !  

Two things where broken (just by opening a simple trace file):
- date parsing didn't work anymore
- a `delete` lead to a segfault

Philippe.

See merge request !14