awaitNullable

Awaits for the single value from the given Mono or null value if none is emitted, suspending the current coroutine and resuming when the mono returns the resulting value or throws the corresponding exception if this publisher had produced error.

This suspending function is cancellable. If the Job of the current coroutine is cancelled or completed while this suspending function is waiting, this function immediately resumes with CancellationException.