fix b0_indices not found

Author: vsaase

nipype/workflows/dmri/fsl/utils.py

@@ -439,6 +439,7 @@ def b0_average(in_dwi, in_bval, max_b=10.0, out_file=None):
     import numpy as np
     import nibabel as nb
     import os.path as op
+    from nipype.workflows.dmri.fsl.utils import b0_indices
 
     if out_file is None:
         fname, ext = op.splitext(op.basename(in_dwi))