drive() and moveTo() methods destroy tour on invalid step index #575
Description
Both the drive() and moveTo() methods destroy the tour if the step index passed to them is invalid. This is not documented in the API reference and is a bit unexpected.
It also leads to the moveNext() and movePrevious() methods destroying the tour if they are called on the last and first step respectively, which causes errors like #564.
I would instead expect the methods to throw an error, so I can catch it in my code.