Change how we hide the search bar.

- Its now less jerky as we do not have to wait for the table view to
contain any rows.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Add a default row height for the questions table view.

- Makes the transition from no questions to having questions in the
table view less jerky.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>