Improve ruleTester's handling of errors
Improve ruleTester's handling of errors

evilebottnawi/stylelint,gaidarenko/stylelint,stylelint/stylelint,stylelint/stylelint,hudochenkov/stylelint,heatwaveo8/stylelint,gucong3000/stylelint,evilebottnawi/stylelint,gucong3000/stylelint,hudochenkov/stylelint,gucong3000/stylelint,stylelint/stylelint,heatwaveo8/stylelint,gaidarenko/stylelint,gaidarenko/stylelint,stylelint/stylelint,heatwaveo8/stylelint,hudochenkov/stylelint