In ApplicationTransactionEditor, determine new objects with "getID()" instead of "getPHID()"
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().
Test Plan: Edited any config value with the web UI.
Differential Revision: https://secure.phabricator.com/D20482