dipy EstimateResponseSH crashes without input in_mask

[salma1601]

Hi,
I am trying to use nipype to do some caching with dipy but I have some problems

from nipype.caching import Memory
from nipype.interfaces import dipy as ndp

dti = memory.cache(ndp.EstimateResponseSH)
out_dti =  dti(in_file=warped_hardi_filename,
               in_bval=bval_filename,
               in_bvec=bvec_filename,
               in_evals=evals_filename)

throws the following error

/home/salma/anaconda2/lib/python2.7/site-packages/nipype/interfaces/dipy/reconstruction.pyc in _run_interface(self, runtime)
214 msk[msk < 0] = 0
215 else:
--> 216 msk = np.ones(imref.get_shape())
217
218 data = img.get_data().astype(np.float32)
NameError: global name 'imref' is not defined

[mgxd]

this should be fixed with #1633 , if you run into further issues with that interface feel free to reopen this issue