fix attribute error

Author: Sayan Shaw

onnxruntime_extensions/_hf_cvt.py

@@ -303,7 +303,7 @@ def post_processing(self, **kwargs):
             if default_inputs is None:
                 encoder_inputs = self.cvt_quadruple.default_encoder_inputs
                 if encoder_inputs is not None and encoder_inputs["fairseq"]:
-                    pass
+                    default_inputs = {} # need to set to empty dict to call .update later
                 else:
                     return g