STY: Further simplification

Co-authored-by: Chris Markiewicz <[email protected]>

Author: DimitriPapadopoulos

nipype/interfaces/io.py

@@ -1025,7 +1025,7 @@ def _list_outputs(self):
                         if self.inputs.sort_filelist:
                             outfiles = human_order_sorted(outfiles)
                         outputs[key].append(simplify_list(outfiles))
-            if any(val is None for val in outputs[key]):
+            if None in outputs[key]:
                 outputs[key] = []
             if len(outputs[key]) == 0:
                 outputs[key] = None