Method to guarantee relay minimum contact switching (wetting) current
I don't see a problem with doing absolutely nothing. If your contact switches and a load isn't connected and then, some time later, it gets connected, if the relay contact is a bit "dry" it will "wet" when at least 5 volts appear across it then behave normally.

If you were trying to switch loads that run from less than 5 volts it might be a problem of course.