BF: Check in visit_Call

Author: effigies

nisext/codegen.py

@@ -339,11 +339,11 @@ def write_comma():
             write_comma()
             self.write(keyword.arg + '=')
             self.visit(keyword.value)
-        if node.starargs is not None:
+        if hasattr(node, 'starargs') and node.starargs is not None:
             write_comma()
             self.write('*')
             self.visit(node.starargs)
-        if node.kwargs is not None:
+        if hasattr(node, 'kwargs') and node.kwargs is not None:
             write_comma()
             self.write('**')
             self.visit(node.kwargs)