Ticket #47912 - Proper handling of "No original_tombstone for changenumber" errors
Bug Description: As analyzed by Ludwig Krispen in
https://fedorahosted.org/389/ticket/47912#comment:1,
an error message "No original_tombstone for ..." is always logged
if original_tombstone does not exist. It should be just for the
case create_tombstone_entry.
Fix Description: This patch place the original_tombstone handling
in "if (create_tombstone_entry)" clause.
https://fedorahosted.org/389/ticket/47912
Reviewed by lkrispen@redhat.com (Thank you, Ludwig!!)
(cherry picked from commit 36381c120773872d3d4d2cb2417f155e6ac790a6)