<i18n dev> RFR: 7197187 Currency.isPastCutoverDate should be made more robust

[Seán Coffey]

As correctly pointed out by Alan, the 7180362 code fix should be tidied 
up to not handle RuntimeExceptions. The NullPointerExcepiton and 
IndexOutOfBoundsException's should not be handled by the 
Currency.replaceCurrencyData(..)

bug report : http://bugs.sun.com/view_bug.do?bug_id=7197187
webrev : http://cr.openjdk.java.net/~coffeys/webrev.7197187/

regards,
Sean.