A trace without data is displayed when a "stacking" defined

The trace trace0 is displayed, although I did not define its data.

Example on codepen - https://codepen.io/x-base/pen/vYZvqZB

code:

var trace = {
  x: [0, 1, 2, 3, 4],
  y: [1, 5, 3, 7, 5],
  mode: "lines+markers", 
  stackgroup: "1",
  fill: "none",
  type: 'scatter'  
}

var trace0 = { ...trace,
  x: [null], // this is recommended workaround https://github.com/plotly/plotly.js/issues/2861#issuecomment-409587725
  y: [null]
};

var trace1 = { ...trace };

Plotly.newPlot('myDiv', [trace0, trace1]);

从 issue 中链接的 CodePen 复现开始，并将其与 issue #2861 中讨论的 workaround 进行比较。追踪为什么 trace0 在没有数据的情况下仍会被渲染，然后验证空 trace 会被省略，同时 trace1 仍能正确显示。