xhtml_style: fix pylint errors and enable coding style

3 jobs for feat/xhtml_style_coding_style in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner1

01:46:36

passed ERP5.PerformanceTest-TestRunner1

00:32:06

failed ERP5.UnitTest-TestRunner1

01:29:37