See https://discourse.phabricator-community.org/t/unable-to-reload-object-that-hasnt-been-loaded/2677.
When editing "Config" objects, they currently get a PHID set outside of the TransactionEditor. They probably should not, but fixing that is likely an involved change.
This causes us to incorrectly fail to detect $is_new correctly and try to reload() and object with no ID.
To work around this, test for new objects with getID() instead of getPHID().