Conference with existing transcriber returns no error to client

[ruozhen-vsee]

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Description

When handling a request to create/enable a transcriber, the code checks conference.hasTranscriber() and builds an IQ.createErrorResponse(...), but the response is never sent back to the requester. As a result, the error is silently ignored and the client receives no feedback.

Problematic block:

if (conference.hasTranscriber()) {
    logger.warn("Request failed, transcriber already available: ${request.iq.toXML()}")
    IQ.createErrorResponse(
        request.iq,
        StanzaError.getBuilder(StanzaError.Condition.conflict).build()
    )
    return
}

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Current behavior

When a transcriber already exists, a conflict IQ error is created
The error response is not sent
Client receives no response (silent failure)

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Expected Behavior

The conflict IQ error should be sent back to the requester
Client should receive a proper XMPP error response stating the conflict

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Possible Solution

Send the error IQ before returning:

if (conference.hasTranscriber()) {
    logger.warn("Request failed, transcriber already available: ${request.iq.toXML()}")

    request.connection.tryToSendStanza(
        IQ.createErrorResponse(
            request.iq,
            StanzaError.getBuilder(StanzaError.Condition.conflict).build()
        )
    )
    return
}

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Steps to reproduce

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Environment details

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