Fixed scenario where an authentication response has no dataset.

Also use getUiForShowing() on all relevant places, and added missing
SaveDataType value.

Test: LoginActivityTest.testFillResponseAuthServiceHasNoData()
Test: manual verification

Fixes: 37711385
Fixes: 38009452

Change-Id: Id69c831f96fb9ac35d1f2d86cfd41e76428c776e