web_js_style_test: fix a pylint warning

13 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

01:56:18

passed ERP5.PerformanceTest-Master

00:23:04

failed ERP5.UnitTest-Master

04:28:44

failed ERP5.UnitTest-Master.Medusa

03:28:19

passed SlapOS.Eggs.UnitTest-Master.Python2

00:17:31

passed SlapOS.Eggs.UnitTest-Master.Python3

00:10:59

failed ERP5.UnitTest-Master

01:40:17

passed SlapOS.Eggs.UnitTest-Master.Python2

00:37:12

passed SlapOS.Eggs.UnitTest-Master.Python2

00:19:43

passed SlapOS.Eggs.UnitTest-Master.Python2

00:24:31

passed SlapOS.Eggs.UnitTest-Master.Python3

00:11:26

passed SlapOS.Eggs.UnitTest-Master.Python3

00:12:11

passed SlapOS.Eggs.UnitTest-Master.Python3

00:10:13