put ref of hasPlotType method on Plots:
put ref of hasPlotType method on Plots:

- to more easily mock _has in test layouts

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