Description of problem: While doing minor update of OSP10, mistral plans are failing to upload with error "string indices must be integers" Version-Release number of selected component (if applicable): OSP10 How reproducible: Always Steps to Reproduce: 1. Run 'openstack overcloud deploy --update-plan-only --templates ...' referring to https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/10/html/upgrading_red_hat_openstack_platform/sect-updating_the_environment#sect-Updating_the_Overcloud 2. Command fails to run with "string indices must be integers". Actual results: Plan fails to update. Expected results: Plan should get updated Additional info: Mistral packages on undercloud: openstack-mistral-api-3.0.2-11.el7ost.noarch openstack-mistral-common-3.0.2-11.el7ost.noarch openstack-mistral-engine-3.0.2-11.el7ost.noarch openstack-mistral-executor-3.0.2-11.el7ost.noarch puppet-mistral-9.5.0-1.el7ost.noarch python-mistralclient-2.1.2-1.el7ost.noarch python-openstack-mistral-3.0.2-11.el7ost.noarch