FIX: Return runtime when sbref is available
@@ -372,7 +372,7 @@ class EstimateReferenceImage(SimpleInterface):
def _run_interface(self, runtime):
if isdefined(self.inputs.sbref_file):
self._results['ref_image'] = self.inputs.sbref_file
- return
+ return runtime
in_nii = nb.load(self.inputs.in_file)
data_slice = in_nii.dataobj[:, :, :, :50]
