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fix(uniswap-v2): Fix silently failing pool addresses #743
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Description
If pool addresses resolver silently fails, we end up seeing no pools in production. This is currently happening for Spookyswap. Instead, fail loud so we can see the failing fetchers, and prevent our system from removing all stale pool tokens (i.e.: its better to keep the stale tokens so that we can at least show balances, even though the prices might be delayed due to the failing fetcher).
Checklist
How to test?