Jonas Jenwald 45ddb12f61 Remove no-op onPull/onCancel streamSink callbacks from the "GetTextContent"-handler
The `MessageHandler`-implementation already handles either of these callbacks being undefined, hence there's no particular reason (as far as I can tell) to add no-op functions here.

Also, in a couple of `MessageHandler`-methods, utilize an already existing local variable more.
2021-09-09 00:01:10 +02:00
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