Revert removal of input_spec on BaseInterface

mwaskom · mwaskom · commit 143922201ae8 · 2017-06-26T15:38:36.000-04:00
diff --git a/nipype/interfaces/base.py b/nipype/interfaces/base.py
@@ -760,6 +760,7 @@ class BaseInterface(Interface):
     This class cannot be instantiated.
 
     """
+    input_spec = BaseInterfaceInputSpec
     _version = None
     _additional_metadata = []
     _redirect_x = False
