fix: fix reading address from market data (#27604)

## **Description**

This PR fixes error when tokensMarketData sometimes resolves with a
small delay which will result in an app error;


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## **Related issues**

Fixes:

## **Manual testing steps**

1. Switch networks back and forth and you should not see the app crash

## **Screenshots/Recordings**

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before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

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Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
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Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

ui/components/app/wallet-overview/aggregated-percentage-overview.tsx

@@ -51,7 +51,7 @@ export const AggregatedPercentageOverview = () => {
         // This is a regular ERC20 token
         // find the relevant pricePercentChange1d in tokensMarketData
         // Find the corresponding market data for the token by filtering the values of the tokensMarketData object
-        const found = tokensMarketData[toChecksumAddress(item.address)];
+        const found = tokensMarketData?.[toChecksumAddress(item.address)];
 
         const tokenFiat1dAgo = getCalculatedTokenAmount1dAgo(
           item.fiatBalance,