Refetch should not happen if no active subscribers #1
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Fixes reduxjs#1530
All logic that checks if there are active subscriptions in the code does a falsey check as well as a keys length check on the subscription sub state, except for the code that refetches valid queries.
Here is an example from the handleUnsubscribe function.
Here is another from invalidateTags.
This PR includes the same check to resolve this issue. See reduxjs#1530 for more information.