Alexandre Ardhuin 4fa32df141
use null aware operators (#32711)
* use null aware operators

* rollback changes about null-aware operator

* disable lint prefer_is_not_empty
2019-05-16 22:25:51 +02:00
..
2019-05-16 22:25:51 +02:00
2019-03-01 08:17:55 +01:00