Filter header added to custom filter list
Steps to reproduce
- Open Advanced tab in options page
- Add the custom filter
[adblock] - Reload the page
Observed behavior
- After 2) Filter list contains new filter
- After 3) Filter list is empty
Expected behavior
- After 2) Filter list is empty and "unexpected filter list header" error message is shown
- After 3) Filter list is empty and no error message is shown