Empty elements eat space in tmgmt review form

Problem/Motivation

There are empty elements in the output of a job item such as admin/tmgmt/items/4 that eat a lot of space.

The dom shows that many empty elements just output a garbage table without content.

The tables is from theme_tmgmt_translator_review_form().
No idea why it is called that many times for so many items.

Proposed resolution

Don't output the garbage table when it isn't in use at all.

Remaining tasks

User interface changes

API changes

Data model changes