1abe155663
In some application setups, the WebSocket server does not transmit the disconnect message to the client, so that the client has no idea that the established connection has been terminated. This issue arises when the application uses SimpleBrokerMessageHandler and the error handler is set to the instance of StompSubProtocolErrorHandler or an extended class that does not override the handleErrorMessageToClient method. The commit fixes disconnect message population so that `java.lang.IllegalArgumentException: No StompHeaderAccessor` exception is not thrown in the handleErrorMessageToClient method in StompSubProtocolErrorHandler class. See gh-30120
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