RF: No local variable for inner_trait

Author: effigies

nipype/interfaces/base/traits_extension.py

@@ -338,9 +338,8 @@ def validate(self, object, name, value):
 
         newvalue = value
 
-        inner_trait = self.inner_traits()[0]
         if not isinstance(value, list) \
-            or (isinstance(inner_trait.trait_type, traits.List) and
+            or (isinstance(self.inner_traits()[0].trait_type, traits.List) and
                 not isinstance(value[0], list)):
             newvalue = [value]
         value = super(MultiPath, self).validate(object, name, newvalue)