improve(PriceClient): Gracefully fallback when price feed queries fail #1293
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- `acrossApi.ts`: Return undefined for a specific token price query if unavailable rather than throwing if any individual query fails - `priceClient.ts`: When falling back to the next `priceFeed`, only query token addresses that we don't have a price for. This allows the `priceFeed. getPricesByAddress()` to "partially resolve", like in the case when querying the Across API via the `acrossApi` adapter.
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acrossApi.ts: Return undefined for a specific token price query if unavailable rather than throwing if any individual query failspriceClient.ts: When falling back to the nextpriceFeed, only query token addresses that we don't have a price for. This allows thepriceFeed. getPricesByAddress()to "partially resolve", like in the case when querying the Across API via theacrossApiadapter.