public static String fix(final String raw) {
        if  ( raw == null || "".equals( raw.trim() )) {
            return raw;
        }
        
        MacroProcessor macroProcessor = new MacroProcessor();
        macroProcessor.setMacros( macros );
        return macroProcessor.parse( raw );
    }
@Test
    public void testWithNull() {
        final String original = null;
        final String result = KnowledgeHelperFixerTest.fixer.fix( original );
        assertEqualsIgnoreWhitespace( original,
                                      result );
    }