code: private boolean valueCanBeConverted(final Value value) {
          try {
              valueConverter.convert(value);
              return true;
          } catch (final RepositoryRuntimeException e) {
              LOGGER.warn("Reference to non-existent resource encounterd: {}", value);
              return false;
          }
      }
docs: This method tests if a given value can be converted.
  The scenario when this may not be true is for (weak)reference properties that target an non-existent resource.
  This scenario generally should not be possible, but the following bug introduced the possibility:
  https://jira.duraspace.org/browse/FCREPO-2323
  
  @param value to be tested for whether it can be converted to an RDFNode or not
  @return true if value can be converted