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Review request for Ambari, Alexandr Antonenko and Sangeeta Ravindran. Bugs: AMBARI-22589 https://issues.apache.org/jira/browse/AMBARI-22589 Repository: ambari Description ------- Stack version page where it usually shows the current and target versions is empty when current stack has services that the to-be-upgraded-to stack does not have. this is due to a null pointer error at the ambari web UI level. Diffs ----- ambari-web/app/messages.js 851e331 ambari-web/app/views/main/admin/stack_upgrade/upgrade_version_column_view.js ae01feb Diff: https://reviews.apache.org/r/64344/diff/1/ Testing ------- patch a trunk cluster to have it be able to install a cluster with IOP 4.2.5 stack. register HDP 2.6 stack where it doesn;t have solr. verify UI, with the patch, pops up an alert dialog and also be able to show the stacks registered instead of an empty page. Thanks, Di Li