fix flake8 issues

Author: josephmje

dmriprep/config/reports-spec.yml

@@ -27,13 +27,10 @@ sections:
       overlaid on the participant's T1w template.
     subtitle: Surface reconstruction
 - name: Diffusion
-  ordering: session, acq, run
+  ordering: session, acquisition, run
   reportlets:
   - bids: {datatype: dwi, desc: summary, suffix: dwi}
   - bids: {datatype: dwi, desc: validation, suffix: dwi}
-  - bids: {datatype: dwi, suffix: 'dwi'}
-    caption: Brain mask calculated on the dwi signal (red contour).
-    subtitle: Brain mask
 - name: About
   reportlets:
   - bids: {datatype: anat, desc: about, suffix: T1w}

dmriprep/workflows/dwi/base.py

@@ -130,16 +130,14 @@ def init_dwi_preproc_wf(
     # For doc building purposes
     if not hasattr(layout, 'parse_file_entities'):
         LOGGER.log(25, 'No valid layout: building empty workflow.')
-        b0_ixs = [0]
         metadata = {
             'PhaseEncodingDirection': 'j',
         }
     else:
         metadata = layout.get_metadata(dwi_file)
 
     inputnode = pe.Node(niu.IdentityInterface(
-        fields=['dwi_file', 'b0_ixs',
-                'bvec_file', 'bval_file']),
+        fields=['dwi_file', 'bvec_file', 'bval_file']),
         name='inputnode')
     inputnode.inputs.dwi_file = dwi_file
     inputnode.inputs.bvec_file = layout.get_bvec(dwi_file)