fix: hero browser error

[melissag-ensemble]

Description

Check for null to prevent browser error logged to console:

Related Issue

Motivation and Context

How Has This Been Tested?

Console error: failed to load module for hero TypeError: Cannot read properties of null (reading 'toLocaleLowerCase')

• Before (has above console error): https://fresh-spectrum-less--adobe-io-website--adobe.hlx.page/tools/sidekick/blocks/hero?nocache=1727121539864

• After (doesn't have above console error): https://second-pass-hero--adobe-io-website--adobe.hlx.page/tools/sidekick/blocks/hero?nocache=1727121539864

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• 12bb522 ❌ (latest)
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[aem-code-sync]

	Page	Scores	Audits	Google
📱	/tools/sidekick/blocks/hero?nocache=1727121539864
🖥️	/tools/sidekick/blocks/hero?nocache=1727121539864