don't set undefined class names via Lib.ensureSingle
don't set undefined class names via Lib.ensureSingle

asolagmbh/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,plotly/plotly.js,plotly/plotly.js,etpinard/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,aburato/plotly.js,etpinard/plotly.js,aburato/plotly.js