The hugin error is not critical, but could be fixed in the spec file. The error for bluez is common in many packages. I've not investigated, there could be a reference to gtk-update-icon-cache in the spec files. But, I think it is more likely that it is in the rpm scripts. It hasn't received any attention, I believe, because it doesn't cause any problems. I agree that it would be nice to eliminate false errors, though.