Comment 3 for bug 1553572

I can recreate locally by stripping the dates from assets_merge.yaml. Considering that, and the fact that "last_modified" field exists but is empty in the generated assets JSON, it's almost certainly caused by the script that finds the last_modified day malfunctioning on the production server.

Specifically this script: http://git.openstack.org/cgit/openstack/app-catalog/tree/tools/asset_history.sh

This could be caused by the server having an older version of git, or maybe git on the server has a different output that fails to get picked up properly by the script.