Merge pull request #816 from satra/fix/helpoutput

Fix/helpoutput

Author: satra

nipype/interfaces/base.py

@@ -785,7 +785,7 @@ def _inputs_help(cls):
 
         opthelpstr = ['', '\t[Optional]']
         for name, spec in sorted(inputs.traits(transient=None).items()):
-            if spec in mandatory_items:
+            if name in mandatory_items:
                 continue
             opthelpstr += cls._get_trait_desc(inputs, name, spec)