message: [heatmap] basic non empty validation
diff: @@ -798,6 +798,14 @@ const visTypes = {
  ],
  },
  ],
  + controlOverrides: {
  + all_columns_x: {
  + validators: [v.nonEmpty],
  + },
  + all_columns_y: {
  + validators: [v.nonEmpty],
  + },
  + },
  },
  horizon: {
  