ifEmptyFlux

@JvmName(name = "ifEmpty_mono_flux")
fun <In : Out, Out> IMonoStep<In>.ifEmptyFlux(alternative: () -> IFluxStep<Out>): IFluxStep<Out>
@JvmName(name = "ifEmpty_flux_flux")
fun <In : Out, Out> IFluxStep<In>.ifEmptyFlux(alternative: () -> IFluxStep<Out>): IFluxStep<Out>