Fix OggStream "invalid header magic" at end of stream

discord/oggparse.py

@@ -77,6 +77,8 @@ class OggStream:
         head = self.stream.read(4)
         if head == b'OggS':
             return OggPage(self.stream)
+        elif not head:
+            return None
         else:
             raise OggError('invalid header magic')