fix: remove duplicate of mandatory parameters from optional parameters

Author: satra

nipype/interfaces/base.py

@@ -780,12 +780,13 @@ def _inputs_help(cls):
 
         manhelpstr = ['', '\t[Mandatory]']
         mandatory_items = inputs.traits(mandatory=True)
+        print mandatory_items
         for name, spec in sorted(mandatory_items.items()):
             manhelpstr += cls._get_trait_desc(inputs, name, spec)
 
         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)