joschiwald 425b181544 DB: Made timestamp columns, those can have no date, nullable instead of saving invalid date '0000-00-00 00:00:00' ...

* This makes our tables mysql strict mode conform

Ref #21113

(cherry picked from commit c2aead1da5)

2018-01-03 15:14:49 +01:00

..

3.3.5

DB: Made timestamp columns, those can have no date, nullable instead of saving invalid date '0000-00-00 00:00:00'

2018-01-03 15:14:49 +01:00