Add provider existence check to WebsocketProvider close emitter logic #3489
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Description
In #3487, the
ganache_e2e
test is crashing unexpectedly because the changes in #3486 (incorrectly) assume that a provider is set while running the close event handler.In practice, the handler's execution priority isn't guaranteed and the provider may no longer be around by the time this logic is run.
Fixes #3487 (see #3488)
Type of change
Checklist:
npm run dtslint
with success and extended the tests and types if necessary.npm run test:unit
with success.