Ignore missing topic errors on the health check #18
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When a reader is setup with a topic that does not yet exist, the lookup will fail with a TOPIC_NOT_FOUND status.
Since this is an error, the health check is becoming degraded because of it, but it really shouldn't, the call to the nsqlookup worked, it is just that the error is misleading.
With this PR, this specific error will be ignored for health check purposes, although it will still be emitted through the
error lookup
event.