TEv1 bug - missing popups

Reference: commit 0fb38556 from branch terminology (essif-lab-framework repo) using docker.

Some of the terms do not give a popup while the concept-file does have a hoverText.

Steps to reproduce:

1. compile commit 0fb38556 from branch terminology (essif-lab-framework repo) using docker.
2. browse to http://localhost:5000/docs/terms/agent.
3. hover over the first instance of the term Actors (first word in first paragraph). You see the popuptext as expected.
4. hover over the term Actor in the section Criterion. You see the popuptext is undefined.

I have no clue what causes this.