Merge pull request #3188 from oesteban/fix/ants-n4-undefined

FIX: Partial rollback of N4BiasFieldCorrection

Author: oesteban

nipype/interfaces/ants/segmentation.py

@@ -537,6 +537,11 @@ def _parse_inputs(self, skip=None):
             self._out_bias_file = bias_image
         return super(N4BiasFieldCorrection, self)._parse_inputs(skip=skip)
 
+    def _list_outputs(self):
+        outputs = super(N4BiasFieldCorrection, self)._list_outputs()
+        if self._out_bias_file:
+            outputs["bias_image"] = os.path.abspath(self._out_bias_file)
+        return outputs
 
 class CorticalThicknessInputSpec(ANTSCommandInputSpec):
     dimension = traits.Enum(