check whether arg has actually a field called 'name'

theano/compile/function_module.py

@@ -825,7 +825,7 @@ class Function(object):
                         argument_name = "argument"
                         if self.name:
                             function_name += ' with name "' + self.name + '"'
-                        if arg.name:
+                        if hasattr(arg, 'name') and arg.name:
                             argument_name += ' with name "' + arg.name + '"'
                         e.args = ("Bad input " + argument_name + " to " +
                                   function_name + " at index %d (0-based)"