Update scores/fwsegsnr.py

scores/fwsegsnr.py

@@ -9,7 +9,7 @@ class FWSEGSNR(ScoreBasis):
 
     def windowed_scoring(self, audios, score_rate):
         if len(audios) != 2:
-            raise ValueError('FWSEGSNR needs a reference and a test signals.')
+            return None
         return fwsegsnr(audios[1], audios[0], score_rate)
 
 def fwsegsnr(x, y, fs, frame_sz = 0.025, shift_sz= 0.01, win='hann', numband=23):