By supplying `bulletpoints_show = False` to the experience function,
the bullet points under each work experience heading will be
entirely removed so only the work experience names themselves
remain. Good for a general CV, or non-american style listings.
Whenever an empty section was encountered we returned `None`
which lead to display artifacts as Quarto tried to interpret
what we actually wanted to display.
Instead, we simply return an empty string which is to be
'displayed' so nothing will be shown.
