slapos_upgrader: do not fail if already migrated

master/bt5/slapos_upgrader/SkinTemplateItem/portal_skins/slapos_upgrader/SoftwareInstance_triggerObjectMigrationToRemoteVirtualMaster.py

@@ -17,6 +17,8 @@ try:
   assert instance_virtual_master_relative_url != remote_node.getDestinationProject()
   assert remote_partition.getFollowUp() == remote_node.getDestinationProject()
 except AssertionError:
+  if instance_virtual_master_relative_url == remote_node.getDestinationProject():
+    return
   # Something wrong here, maybe the instance was already migrated
   raise