feat(lib): update scripts/aem.js to aem.js@1.5.0 (adobe#313)

Test URL: https://update-lib-aem-minor-1-5-0--aem-boilerplate--adobe.hlx.live/
Release Notes: https://github.com/adobe/aem-lib/releases/tag/v1.5.0

Co-authored-by: semantic-release-bot <semantic-release-bot@martynus.net>

scripts/aem.js

@@ -451,7 +451,10 @@ function decorateSections(main) {
       const meta = readBlockConfig(sectionMeta);
       Object.keys(meta).forEach((key) => {
         if (key === 'style') {
-          const styles = meta.style.split(',').map((style) => toClassName(style.trim()));
+          const styles = meta.style
+            .split(',')
+            .filter((style) => style)
+            .map((style) => toClassName(style.trim()));
           styles.forEach((style) => section.classList.add(style));
         } else {
           section.dataset[toCamelCase(key)] = meta[key];