Sync updater: add js/test/beautify-html-tests.js
[sync]
Add tests for empty braces
https://github.com/beautify-web/js-beautify/commit/b23a9efc762594364980a688d40be22e1d0e3782
Create html beautifier tests generator
https://github.com/beautify-web/js-beautify/commit/283b1c445953b5af8ffd84e647b085af1249d1ee
Sync runTests(): add run_html_tests() call