fix #8335225731251 removing border color removes arrow
fix #8335225731251 removing border color removes arrow

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