ikt should not quit on ObjectNotFound

[jorgenpt]

When one tries to call an nonexisting method on a variable, this happens:

ikt> i = 'foo'; ikt> i|invalid_call; System.exceptions.ObjectNotFound?: Could not find method invalid_call that takes 0 argument(s)

called from ? line 1 called from (ikt)

and afterwards, ikt quits. This should be displayed (or a simpler error, like "Could not find method invalid_call for 'i' that takes 0 argument(s)") and prompt should be returned.

[mooneer]

Fixed in r554.