Explain the problem as you see it
Empty search nodes clutter up related content
Why is this a problem for you?
It pressures me to keep related content sparser than it should be, especially for information that doesn't apply to most nodes.
Suggest a solution
Have a checkbox in the node/supertag configuration to hide empty nodes
OR
Automatically hide empty search nodes in related content, with a little button to show them (like hidden fields have)