fixes B.Bergman_14_02 not updating

This is an ugly fix, and I am aware of that. However, someone I will not name (name begins with a 'S' and ends with 'verker') wants to be able to update B.Bergman13_02.

I'll look deeper into this when I'll have time, but for now, this works and can't break anything that is not already broken.

Details : 24-34649 Aggregate QC (Library Validation) has no date in the lims. That makes the ['date'] accesses return None, and None.replace() is not very effective.