Due to an optimisation earlier, the model and selected index in the per-object settings panel couldn't be found. This was giving errors and making the per-object settings unusable.
Contributes to issue CURA-458.
I found this other place that was helping to display the message that warns that print sequcence is set per-object. Since the latter is no longer possible, this message shouldn't be displayed any more.
Contributes to issue CURA-458.
Print sequence can no longer be chosen per-object, so the warning that displays when you choose print sequence per-object is no longer necessary.
Contributes to issue CURA-458.