DataTable: Retain consistency of returning `null`.
DataTable: Addition of `null` check.
DataTable: Addition of unit test.
Merge remote-tracking branch 'origin/dt-refreshrow-fix' into dev-master
DataTable: Build.
uploaderror payload includes the xhr response
using the same naming as elsewhere
Uploader: Build.
Merge remote-tracking branch 'upstream/dev-master' into dev-3.x