add hovertemplateString test for the number *0*
add hovertemplateString test for the number *0*

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