Errors accessing states for People

[robynstuart]

ppl = ss.People(1000)
ppl.age

gives the following:

Traceback (most recent call last):
  File "/Users/robynstuart/anaconda3/envs/starsim/lib/python3.9/site-packages/IPython/core/formatters.py", line 223, in catch_format_error
    r = method(self, *args, **kwargs)
  File "/Users/robynstuart/anaconda3/envs/starsim/lib/python3.9/site-packages/IPython/core/formatters.py", line 708, in __call__
    printer.pretty(obj)
  File "/Users/robynstuart/anaconda3/envs/starsim/lib/python3.9/site-packages/IPython/lib/pretty.py", line 410, in pretty
    return _repr_pprint(obj, self, cycle)
  File "/Users/robynstuart/anaconda3/envs/starsim/lib/python3.9/site-packages/IPython/lib/pretty.py", line 778, in _repr_pprint
    output = repr(obj)
  File "/Users/robynstuart/Documents/git/starsim/starsim/arrays.py", line 197, in __repr__
    arr_str = np.array2string(self.values, max_line_width=200)
  File "/Users/robynstuart/Documents/git/starsim/starsim/arrays.py", line 264, in values
    return self.raw[self.auids]
IndexError: index 0 is out of bounds for axis 0 with size 0

1. Is there a way to create people with initialized properties ?
2. If not, could this have a more useful error message?