If the gears argument contains invalid gears, then these are ignored but a warning is issued.
valid_gears_arg(object, gears = NULL, error_on_empty = FALSE)
A vector of gear names.
A MizerSim or MizerParams object from which the gears should be selected.
The gears to be selected. Optional. By default all gears are selected. A vector of gear names.
Whether to throw an error if there are zero valid gears. Default FALSE.