Running 1 bulb on a dual ballast

[mr_alberta]

Hi,

Does anyone know how bad it is or if it is bad at all to be running only one bulb on a dual ballast? It is a BlueWave 7 ballast (dual HQI) but only has one switch controlling everything. While I can run 2 pendants (I have them and the bulbs), I don't really want to at the moment. I only want to run 1 pendant. So, my question is, how bad would it be for the ballast to run without a load on it (i.e. no bulb)?

Thanks.