This is causing a regression which is breaking most of our test cases using
simple iteration over `NDArrayIter`.
```
.com/airbnb/bighead/python/bighead/ml_frameworks/mxnet/gluon.py", line 434, in
transform
for batch in data_iter:
File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py", line
228, in __next__
return self.next()
File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py", line
680, in next
label = self.getlabel()
File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py", line
750, in getlabel
return self._batchify(self.label)
File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py", line
732, in _batchify
first_data = self._getdata(data_source, start=self.cursor)
File "/anaconda3/envs/py36/lib/python3.6/site-packages/mxnet/io/io.py", line
694, in _getdata
end = end if end is not None else data_source[0][1].shape[0]
IndexError: list index out of range
```
[ Full content available at:
https://github.com/apache/incubator-mxnet/pull/12285 ]
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