dipy.data.read_bundles_2_subjects doesn't fetch data as expected

[arokem]

In [1]: import dipy.data as dpd

In [6]: dpd.read_bundles_2_subjects()
---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
<ipython-input-6-997ccd37e15a> in <module>()
----> 1 dpd.read_bundles_2_subjects()

/Users/arokem/source/dipy/dipy/data/fetcher.py in read_bundles_2_subjects(subj_id, metrics, bundles)
    938 
    939     if 'fa' in metrics:
--> 940         img_fa = nib.load(pjoin(dname, subj_id, 'fa_1x1x1.nii.gz'))
    941         fa = img_fa.get_data()
    942         affine = img_fa.affine

/Users/arokem/source/nibabel/nibabel/loadsave.py in load(filename, **kwargs)
     38     '''
     39     if not op.exists(filename):
---> 40         raise FileNotFoundError("No such file: '%s'" % filename)
     41     sniff = None
     42     for image_klass in all_image_classes:

FileNotFoundError: No such file: '/Users/arokem/.dipy/exp_bundles_and_maps/bundles_2_subjects/subj_1/fa_1x1x1.nii.gz'

[arokem]

This is fixed in #1219