fix errors when clicking on standard checkout before gas estimation on checkout page
- Dominant language
- JavaScript
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Description
### Description
This error happens when a user clicks on standard checkout / checkout with zksync when the gas cost recommendation result hasn't been returned.
Reference: https://github.com/gitcoinco/web/issues/9488
### Reproduction
1. open gitcoin.co/grants/cart
2. make sure you have grants in your cart
3. quickly click on standard checkout or zksync before the gas cost recommendation is returned
3. see error(s) attached.



### Acceptance Criteria
GIVEN I am on the checkout page before the gas recommendation
WHEN I click on standard checkout
THEN there should be no error(s).
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Assessment
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