RVI (IRB) is associated with a L2 VLAN and [for any/all vendors] a VLAN is only up when some interface/port within the VLAN is up. So with no interfaces active, VLAN is down and therefore corresponding RVI/IRB is down.
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RVI (IRB) is associated with a L2 VLAN and [for any/all vendors] a VLAN is only up when some interface/port within the VLAN is up. So with no interfaces active, VLAN is down and therefore corresponding RVI/IRB is down.