I have a dynamic diagram in my Excel sheet. Sometimes, one data row can be empty. But Excel keeps drawing a tiny tiny little row. Almost not visible.

Here is a screenshot:

The n on the left side is the number of entries, the diagram itself is the average of the entries. So, with n > 0 it works as expected.
But is n = 0, there is a tiny little colored “bar”. More like just a line.

How do I remove that line?

Also, depending on the zoom, the bar is bigger/smaller.
For example here with a zoom of 140%:

The line for n=0 is almost as big as the one for n=1. Can be very confusing