Remove use of error.message in onerror() #3237
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The event type for `onerror()` is a vanilla `Event` that has no `message` property (or anything interesting about the error). Further info from this StackOverflow question: [Javascript doesn't catch error in WebSocket instantiation](https://stackoverflow.com/questions/31002592/javascript-doesnt-catch-error-in-websocket-instantiation/31003057#31003057).
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The event type for
onerror()is a vanillaEventthat has nomessageproperty (or anything interesting about the error). Further info from this StackOverflow question: Javascript doesn't catch error in WebSocket instantiation.