restoring previous version with default (either trait)

Author: djarecka

nipype/interfaces/freesurfer/preprocess.py

@@ -1785,6 +1785,7 @@ class RobustRegisterInputSpec(FSTraitedSpec):
     out_reg_file = traits.Either(
         True,
         File,
+        default=True,
         usedefault=True,
         argstr='--lta %s',
         desc='registration file; either True or filename')

nipype/interfaces/freesurfer/registration.py

@@ -422,6 +422,7 @@ class MRICoregInputSpec(FSTraitedSpec):
         True,
         File,
         argstr='--lta %s',
+        default=True,
         usedefault=True,
         desc='output registration file (LTA format)')
     out_reg_file = traits.Either(

nipype/interfaces/freesurfer/utils.py

@@ -1383,6 +1383,7 @@ class MRIPretessInputSpec(FSTraitedSpec):
         traits.Str('wm'),
         traits.Int(1),
         argstr='%s',
+        default='wm',
         mandatory=True,
         usedefault=True,
         position=-3,