taxonomy argument

Hi there,

I am new to this group and I say hello to everybody.
lso I am pretty new to Drupal, started in 2008 but
then left it for a year. Anyway here is my issue:

I build a view to show all parent category terms of a taxonomy.

What I wonder now is, how I configure such a view, that it only
lists terms that are related to nodes.

Is it clear what I mean? Because now, when I click on an item
from that list (generated by my view), which isn't
related to any node, it says:
"There are currently no posts in this category."

How can I list only terms that are related to a node?