Revision 1839662

Don't scan for moves for 'local missing' conflicts unless a YCA is known.

Prevent the resolver from embarking on an endless search in case of
a 'incoming edit vs. local missing' conflict where no YCA can be
found which would cap our search through history.

Reported by: Dag-Erling Smørgrav <des{_AT_}des.no>
https://svn.haxx.se/users/archive-2018-08/0038.shtml

* subversion/libsvn_client/conflicts.c
  (find_deleted_rev): Account for a NULL moves-table.
  (find_operative_moves, find_revision_for_suspected_deletion): Make search
   for moves optional. The caller can now pass a NULL moves array to indicate
   that moves should not be searched for.
  (conflict_tree_get_details_local_missing): Only ask for move information if
   a YCA was found.