Revert removal of no_handle from State.run()

[pederhan]

Commit 7394722 needs to be reverted.

Yeah, didn't think this one through at all; by not having any handling of StatusError exceptions inside State.run() itself, we just instantly exit the REPL with no recourse to recover it. We should instead catch StatusError inside State.run() and then raise a SystemExit in its place if it's unhandled.

This will let certain commands catch StatusError if they want to, but by default they are turned into SystemExit calls through the error handler we already have.