fix: prevent getPrice from revert in UniswapPairPriceAdapter #235
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Now function getPrice in UniswapPairPriceAdapter maybe revert when call function priceOracle.getPrice in function getPrice or _getUniswapPrice. This will prevent other oracle adapters which added after UniswapPairPriceAdapter from provide price. To resolve this issue, I use try/catch clause to check revert case. When revert, new version of getPrice will return (false, 0);