Promise rejection when typing CSS

When typing in the CSS box, if the CSS is invalid, you get the promise rejection error seen below. If CSS is valid and you're typing, there's no promise rejection error. The app still appears to be functioning correctly when the console is closed, however it freezes popcode virtually every time you type CSS when the console is open.

在控制台打开时，在 CSS 框中输入无效 CSS 以重现问题，然后检查报告的 promise rejection 以及编辑器路径对 CSS 更改的处理。完成标准是：无效 CSS 不再使 Popcode 卡死或产生报告的 rejection，同时有效 CSS 的编辑仍能正常工作。