If the headers of the given message already contain a
{@link hunt.stomp.simp.SimpMessageHeaderAccessor#DESTINATION_HEADER
SimpMessageHeaderAccessor#DESTINATION_HEADER} then the message is sent without
further changes.
<p>If a destination header is not already present ,the message is sent
to the configured {@link #setDefaultDestination(Object) defaultDestination}
or an exception an {@code IllegalStateException} is raised if that isn't
configured.
@param message the message to send (never {@code null})
If the headers of the given message already contain a {@link hunt.stomp.simp.SimpMessageHeaderAccessor#DESTINATION_HEADER SimpMessageHeaderAccessor#DESTINATION_HEADER} then the message is sent without further changes. <p>If a destination header is not already present ,the message is sent to the configured {@link #setDefaultDestination(Object) defaultDestination} or an exception an {@code IllegalStateException} is raised if that isn't configured. @param message the message to send (never {@code null})