Use 'if and only if' wording

I noticed that you may be able to express some of the spec in a more precise way by borrowing wording from the field of logics.

This section MUST NOT be rendered unless the data list is empty.

This sentence has a double negation which can make it a bit confusing.
You can use the following wording instead and make the coupling crystal clear:

This section MUST be rendered if and only if the data list is empty.

Provide feedback