Jonas Jenwald de0e7a9a68 Check that the MessageHandler isn't already terminated in the onFailure handler in src/core/worker.js (issue 8584)
All other code-paths already checks that the `MessageHandler` isn't terminated, but apparently `onFailure` was missing that check (compare e.g. with the `onSuccess` function).
From what I can tell, this is only an issue if workers are *disabled*, hence why I didn't bother adding a unit-test.

Fixes 8584.
2017-06-30 10:11:13 +02:00
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