slapos_upgrader: do not return too early

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

@@ -28,6 +28,8 @@ if root_software_instance is not None:
     root_instance_virtual_master_relative_url = root_partition.getParentValue().getFollowUp(None)
     if ((root_instance_virtual_master_relative_url is not None) and
         (root_instance_virtual_master_relative_url != instance_tree_virtual_master_relative_url)):
+      instance_tree_migration_needed = True
+
       # ensure no software instance is not on the instance tree
       # virtual master. If so, keep the instance tree virtual master
       for sql_result in portal.portal_catalog(
@@ -39,8 +41,9 @@ if root_software_instance is not None:
         if instance_partition is not None:
           instance_virtual_master_relative_url = instance_partition.getParentValue().getFollowUp(None)
           if (instance_virtual_master_relative_url == instance_tree_virtual_master_relative_url):
-            return
+            instance_tree_migration_needed = False
 
+      if instance_tree_migration_needed:
         edit_kw ={'follow_up_value': None}
         activate_kw = {'tag': tag}
         instance_tree.edit(**edit_kw)