fix(comet): grpc server bucket if nil (#385)
fix(comet): grpc server bucket if nil (#385)

* fix: room 只有一个 channel 时 Online 不会自减

* fix(comet): grpc server bucket if nil

Co-authored-by: Cai.Wenbi <5b462b3269e740d8554d399a49859687485749ef@olaola.chat>
Terry-Mao/goim,Terry-Mao/goim