unflatten crashes on an empty larry

[kwgoodman]

unflatten crashes on an empty larry:

>> y = larry([])
>> y.unflatten()
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)

/home/kg/<ipython console> in <module>()

/ba/devel/larry/la/deflarry.pyc in unflatten(self)
   3013 if self.ndim != 1:
   3014 raise ValueError, 'Only 1d larrys can be unflattened.'
-> 3015
   3016 if self.shape == (0,):
   3017 return larry([])

IndexError: invalid index