docs: @Programmatic
      public List<CommunicationChannelOwnerLink> findByOwner(final CommunicationChannelOwner owner) {
          if(owner == null) {
              return null;
          }
          final Bookmark bookmark = bookmarkService.bookmarkFor(owner);
          if(bookmark == null) {
              return null;
          }
          return container.allMatches(
                  new QueryDefault<>(CommunicationChannelOwnerLink.class,
                          "findByOwner",
                          "ownerObjectType", bookmark.getObjectType(),
                          "ownerIdentifier", bookmark.getIdentifier()));
      }