Fixed empty packet parsing bug

Packet iterator was not advanced for empty packets.
Remove unused annotation highlight div

This is now done using CSS. For annotation-heavy documents this change makes the DOM much lighter.
Merge pull request #5566 from MaMazav/Bug_fix_Empty_packet_advance_iterator

Fixed empty packet parsing bug
Merge pull request #5569 from timvandermeij/annotation-rewrite-1

Remove unused annotation highlight div