Fix: Add null check for chain to secondary token balance flow

[Adamj1232]

Description

Add null check for chain to secondary token balance flow

Checklist

• Increment the version field in package.json of the package you have made changes in following semantic versioning and using alpha release tagging
• Check the box that allows repo maintainers to update this PR
• Test locally to make sure this feature/fix works
• Run yarn check-all to confirm there are not any associated errors
• Confirm this PR passes Circle CI checks
• Add or update relevant information in the documentation

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
web3-onboard-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 15, 2023 6:54pm

[socket-security]

New dependency changes detected. Learn more about Socket for GitHub ↗︎

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👍 No new dependency issues detected in pull request

Bot Commands

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Pull request alert summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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📊 Modified Dependency Overview:

➕ Added Package	Capability Access	+/- Transitive Count	Publisher
@web3-onboard/core@2.15.5	None	+0	cmeisl