Merge pull request #2235 from david-95/hongliang-dev

add filter for double punctuation in sentences; add homonym, test=tts

paddlespeech/t2s/frontend/phonectic.py

@@ -101,7 +101,8 @@ class English(Phonetics):
                 if (phn in self.vocab_phones and phn not in self.punc) else "sp"
                 for phn in phones
             ]
-            phones_list.append(phones)
+            if len(phones) != 0:
+                phones_list.append(phones)
 
         if merge_sentences:
             merge_list = sum(phones_list, [])