make sure items inside array container set to null are honored in frames
make sure items inside array container set to null are honored in frames

- items set to undefined produce the same outcome
  as nestedProperty makes no distinctions between null and undefined

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