opening a QBS project in Qt Creator causes an additional empty run configuration to be created

When I open my QBS project in Qt Creator, two run configurations are created:

• A run configuration for my sole applicationbundle target
• An empty 'custom executable' run configuration with working directory % {buildDir}

Only the first configuration should be created.

I do have a generic product that uses a Rule to build a disk image (but obviously has no target executable). I thought this might be a factor but I removed its qbs file from the references, and the empty run configuration still appeared.