manufacturer filter and products out of stock

[p.barg]

Hello,

we're using the manufacturer filter in category view.
We noticed that in the drop-down list manufacturers are also listed if
they have no products with stock level > 0 assigned. If one of those manufacturers is selected, a message is shown that no products have been found. Is this the intended functionality?
I'm not sure if that always used to be like that in former versions of VM.

Is there a way to eliminate these manufacturers from the drop-down list?

Thanks, Petra

Virtuemart 4.2.18