res_pjsip_outbound_publish: state potential dropped on reloads/realtime fetches

When reloading, or fetching realtime data, if the "apply" failed for any
numerous reasons the current state object would not be maintained. This
potentially resulted in publishes being stopped for some states/clients when
they should not have been.

This patch makes it so the current state object is kept upon any type of reload/
fetch failures.

Change-Id: Iab6020c116d628ed2ae81183e987e2eaa3c90b30