No feedback given when adding invalid filter
Steps to reproduce
- Open Advanced tab in options page
- Add the invalid filter
#$#foo
Observed behavior
- Nothing happens in UI.
- JavaScript console shows the following error:
Uncaught (in promise) TypeError: Cannot read property 'dataset' of null
at HTMLElement.onerror (desktop-options.js:2952)
at browser.runtime.sendMessage.then.errors (desktop-options.js:3049)
Expected behavior
- Error message is shown in UI.
- No errors shown in JavaScript console.