[refactor] use AddEventListener check instead of OnMessage check #989
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Use "len(es.onEvent) == 0 " check instead of "if _, found := es.onEvent[defaultEventName]" check.
Sometimes the implementation of the sse server is not standard, and there is no event with the type of message.
In my opinion, users should be able to use it as long as they have added any eventListener.
Separated from PR #985