An empty paragraph should not result in any visible output
A timeline paragraph that has been added, but no values filled in, results in a colored mark in the content to which it was added:
This is a hard problem, for paragraphs to inspect themselves and identify if they are empty (as they are very flexible) but it's solvable, or at least able to be mitigated by having the fields themselves (within the paragraph) only produce wrapping output if they hold a value.