fix(linter): do not explicitly set to undefined
fix(linter): do not explicitly set to undefined
pablojim/highcharts-ng,huangchaosuper/highcharts-ng,HawiCaesar/highcharts-ng,HawiCaesar/highcharts-ng,pablojim/highcharts-ng,mdedetrich/highcharts-ng,huangchaosuper/highcharts-ng,mdedetrich/highcharts-ng