When making a presentation in a hurry, one usually leave a last empty paragraph
on many slides.

Some users also use empty paragraphs for vertical spacing, as it is sometimes
more comfortable that positioning the content box with the mouse (which messes
up the relationship with layout from presentation-wide slide design etc.)

MS PowerPoint has a comfortable behaviour with respect to empty paragraphs on
slides: when they are bulleted and empty, it shows the bullet in a dimmed color
when editing the presentation, and hides completely whne the presentation is played.

This way, one doesn't have to go through the whole presentation and delete empty
paragraph just to get rid of those dangling dots from some slides. This saves
the day especially if one is in a hurry to prepare a presentation ASAP.