bug: subscribe to shutting down node

[weboko]

Description

In our e2e test suit I discovered rare case when js-waku is still functional but docker nwaku node is getting shut down. This causes request response to be an empty array instead of failing.

This in turn throws not caught error later on.

Code: https://github.com/waku-org/js-waku/blob/981248eedd2192e0a160939e5ff0d7133b12db59/packages/core/src/lib/filter/filter.ts#L118

Expected Behavior

We should return GENERIC error in that case.