(bug 44911) Avoid fatal on changes to deleted item.

Change entries for an entitiy X may be processed by the client
even after entitiy X was removed from the repository. There should not
be an error in this case.

Change-Id: I3a29b3b7dfe7363e28e0c9a9d42f15d7c854e41c
Merge "(bug 44911) Avoid fatal on changes to deleted item."