PaginatedCollection raising AttributeError on next

[vpipkt]

Consider this innocent looking example.

next(dataset.data_rows(DataRow.uid == datarow_id))

This raises:

Stack trace

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-50-dc7c6a64cb8a> in <module>
----> 1 next(dataset.data_rows(DataRow.uid == datarow_id))

~/projects/p-street/.venv/lib/python3.7/site-packages/labelbox/pagination.py in __next__(self)
     41 
     42     def __next__(self):
---> 43         if len(self._data) <= self._data_ind:
     44             if self._fetched_all:
     45                 raise StopIteration()

AttributeError: 'PaginatedCollection' object has no attribute '_data_ind'

Root cause seems to be that PaginatedCollection does not initialize self._data_ind in constructor.

In current implementation, the above attempt must be called as:

next(iter(dataset.data_rows(DataRow.uid == datarow_id)))

[vpipkt]

I note also that the PaginatedCollection docs say it is for internal use. However, the pattern for public calls in such a case as above is unclear to me.