MWPW-146743 - Fix get image caption

[JasonHowellSlavin]

• Removes the return of "undefined" in getImageCaption. If caption is ever appended to the DOM without checking for it's value first, it will result in an "undefined" string getting added to the DOM.

Resolves: MWPW-146743

Test URLs:

• Before: https://main--bacom-blog--adobecom.hlx.live/blog/basics/knowledge-areas?martech=off
• After: https://fix-get-image-caption--bacom-blog--adobecom.hlx.live/blog/basics/knowledge-areas?martech=off

[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

• c56f3bc ✅ (latest)
• 42d1b9d ✅
• a5f01fe ✅
• e30fe7f ❌

[aem-code-sync]

Page	Scores	Audits	Google
/blog/basics/knowledge-areas?martech=off