fix: Crash when calculating mid price in swap

[memoyil]

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PR-Codex overview

This PR enhances error handling in the exchange.ts file by wrapping the calculation of outputAmountWithoutPriceImpact in a try-catch block. This ensures that if an error occurs during the calculation, it logs the error and sets a default value instead of failing silently.

Detailed summary

• Added a try-catch block around the calculation of midPrice and outputAmountWithoutPriceImpact.
• In the catch block, logs the error message to the console.
• Sets outputAmountWithoutPriceImpact to a default value of CurrencyAmount.fromRawAmount(trade.outputAmount.currency, 0) if an error occurs.

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