code: @SuppressFBWarnings(justification = "Accepting that this is a bad practice - but made more sense in this use case",
              value = {"NP_BOOLEAN_RETURN_NULL"})
      public Boolean isRetireJsFilterNonVulnerable() {
          return (line != null && line.hasOption(ARGUMENT.RETIREJS_FILTER_NON_VULNERABLE)) ? true : null;
      }
docs: Returns whether or not the retireJS analyzer should exclude
  non-vulnerable JS from the report.
  
  @return <code>true</code> if non-vulnerable JS should be filtered in the
  RetireJS Analyzer; otherwise <code>null</code>