Bugfix: Avoid implosion of empty <option>s

When using select2 on

<select>
  <option value="empty"></option>
  <option>Val 1</option>
  <option>Val 2</option>
</select>

The top option will not have the correct height.
Added Romanian translation
Merge pull request #1043 from Smartik89/master

Romanian translation.
Merge pull request #1042 from JensRantil/fix-issue-1042

Bugfix: Avoid implosion of empty <option>s
Add popular items, show popular items when click.