Fix issue for subscriptions where prevCondition is a subscriber #5
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Change
Based on this ioredis PR: redis/ioredis#1900
Problem / Why
currently, cluster's "subscriber" check is done on "condition/preCondition" object level. But "condition.subscriber" property may be a boolean, not an object. So if "subscriber" as an object exists only on "prevCondition", we will never get there. This fix makes sure we pick the first available subscriber object (if any). This might be useful for us as "bull" uses subscriptions when dealing with queues.
References