hide empty tabs

[seebi]

Describe the bug

In case there is no content in a tab, the tab should not be shown.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://diggr.github.io/diggr-video-game-vocabulary/#id-b3eac554b0de83fcaeb76a0649ddb2fa

Expected behavior

Tabs without content can be removed.

Screenshots

Additional context
Add any other context about the problem here.