UI checklist for next update

[sanghoonio]

• After deleting the last view while it is currently selected, you can't unselect the deleted view because the reactselect gets disabled. Either add a check so that if view list is empty, or if currently selected view no longer exists in view list, unselect the view.
• You can't unselect a schema once one is assigned (can change to other schema, just can't remove)
• Add a choose schema modal you open by clicking on yellow 'no schema' button next to 'save' and 'discard' buttons. Maybe pass in the validation passed modal
• In validation passed modal, make selectinput corner rounding consistent with button (rounded-1)