Fix NoneType object error

self.encoder is initialized for the first time with a play function.
If called before the play function is done an error will occur.

Author: rinjugatla

discord/voice_client.py

@@ -882,6 +882,8 @@ def send_audio_packet(self, data: bytes, *, encode: bool = True) -> None:
 
         self.checked_add("sequence", 1, 65535)
         if encode:
+            if not self.encoder:
+                self.encoder = opus.Encoder()
             encoded_data = self.encoder.encode(data, self.encoder.SAMPLES_PER_FRAME)
         else:
             encoded_data = data