fix: cover image redirect to undefined (#29311)

fixes #29310

## Bug

- [x] Related issues linked using `fixes #29310`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [x] Make sure the linting passes

examples/cms-strapi/components/cover-image.js

@@ -20,9 +20,13 @@ export default function CoverImage({ title, url, slug }) {
   )
   return (
     <div className="sm:mx-0">
-      <Link href={`/posts/${slug}`}>
-        {slug ? <a aria-label={title}>{image}</a> : image}
-      </Link>
+      {slug ? (
+        <Link href={`/posts/${slug}`}>
+          <a aria-label={title}>{image}</a>
+        </Link>
+      ) : (
+        image
+      )}
     </div>
   )
 }