Default LocalDate invalid in non-intuative ways

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If you create a default LocalDate with new LocalDate() or default(LocalDate) or 
by not assigning to a LocalDate field and then compare it to another (i.e. 
date1.Equals(date2)), you will get a null reference exception.

I understand that the default value is an invalid value by design, but it 
should really throw an exception to that effect rather than the null exception.

I'm using 1.0.0-beta2

Original issue reported on code.google.com by WalkerCo...@gmail.com on 5 Oct 2012 at 6:30