2cdfa33137b69b82c8354dd5d0bd58acfe2d89d9

calling BKE_ptcache_ids_from_object() could recursively call BKE_object_handle_update(), when there is no reason to update object transforms at all. Add option not to do any updates and just return an object list.
add some missing NULL checks, a few parts of the code used a pointer then checked it for NULL after.
fix [#29616] Crash/infinite loop from missing cyclic check in group/dupligroups (unlikely/intentional)
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