Enable formatlesspaste plugin to remove empty tags RT#57942

*  obey coding guidelines: check
*  write JSLint compliant code: doesn't work for my ide
*  write JSDoc for every method you touched during your implementation: check
*  write a human-readable :) Changelog entry that describes your change: check
*  add a qunit test (if it makes sense) and/or document the steps to manually test it (in a separate guides page): don't know if it makes sense
*  test your changes in Internet Explorer 7, 8, 9 and the latest Firefox and latest Chrome: works for chrome, only using jQuery
*  document your changes in a guides page: it's only a small bugfix
*  include this list in a your pull request: check