Avoid problems in toolbar startup.

The correct thing to do is detect when the exception might happen and avoid
it, not try to catch it.
Add a toggle for the parachute warning.

It defaults to on since this is a useful feature for people new to DRE,
but it is most annoying for veterans.
Plug an NRE hole.

And remove the superfluous try/catch block. Having the correct Event
name helps.