Error reading empty stream if it is the last step in a Protocol

[naegelejd]

Error reading empty stream if it is the last step in a Protocol

[naegelejd]

This bug can be avoided (masked) by

1. adding another step after the stream and reading/writing it accordingly, or
2. using the "singular" r.ReadStrings(std::string) read method

The reason is that the generated Close method doesn't perform the same state check(s) that are performed per-step, specifically the

if stepIndex > 0 && protocol.Sequence[stepIndex-1].IsStream() {
    fmt.Fprintf(w, "if (state_ == %d) {\n", previousUnobservedcompletionState)
    ...

check currently performed in the writeReaderStateCheckIfStatement function in protocols.go.

Solution: We can just add this check for stream steps in the generated Close method.