BUG: Fix object scalar return type of 0-d array indices

PyArray_Result was called when it should not have been. This caused
object arrays of 0-d arrays have the inner array converted to a
scalar:

`np.array([np.array(0), None])[0] -> np._float(0)`

The same case happened to recarray field access when indexing
more than one field. This fixes it.
Merge pull request #4109 from seberg/scalar-object-indexing

BUG: Fix object scalar return type of 0-d array indices