Fatal error if terms_of_use_data is empty

Problem/Motivation

If the body field in the select node for terms of use data is empty there is an error thrown
InvalidArgumentException: $string ("") must be a string.
Also there should be a check if body field exists. Maybe it is better to allow to choose the field to be rendered with viewbuilder? or maybe selecting a viewmode for rendering the text?

Proposed resolution

Add checks for empty data before calling t() function.
Discuss on the improvement of rendering the text and not getting raw value.

Remaining tasks

Create patch.

User interface changes

Add the settings for rendering text from field (selectable) or complete node (view mode selectable).

I'm willing to help to implement the changes. I just want to ask for community opinion on how it would be more useful for the end users (please check User interface chnages and resolution sections).