Fix Worker was terminated error when loading is cancelled
#20503
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Fixes mozilla#11595, where cancelling loading with `loadingTask.destroy()` before it finishes throws a `Worker was terminated` error that CANNOT be caught. When worker is terminated, an error is thrown here: https://github.com/mozilla/pdf.js/blob/6c746260a98766b8ece27018d2c48436cfcafa24/src/core/worker.js#L374 Then `onFailure` runs, in which we throw again via `ensureNotTerminated()`. However, this second error is never caught (and cannot be), resulting in console spam. There is no need to throw any additional errors since the termination is already reported [here](https://github.com/mozilla/pdf.js/blob/6c746260a98766b8ece27018d2c48436cfcafa24/src/core/worker.js#L371-L373), and `onFailure` is supposed to handle errors, not throw them.
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Fixes #11595, where cancelling loading with
loadingTask.destroy()before it finishes throws aWorker was terminatederror that CANNOT be caught.When worker is terminated, an error is thrown here:
pdf.js/src/core/worker.js
Line 374 in 6c74626
Then
onFailureruns, in which we throw again viaensureNotTerminated(). However, this second error is never caught (and cannot be), resulting in console spam.There is no need to throw any additional errors since the termination is already reported here, and
onFailureis supposed to handle errors, not throw them.