Problem with the setting "Always linkify following elements. Override above. (CSS selector)"

[decembre]

If i add a slector in "Always linkify following elements. Override above. (CSS selector)",
and after i want delete totally it, it is not possible.
The form don't want be empty.
I need to let in it something which match noting to make it save it.
If i try to save an empty form, it return to the previous value typed in it.

It's why i understang many errors this last:
I have found it was due to this setting, i correct it and after .... i don't understand why these problems remain:
now i known why;
:-)

[eight]

Good catch. Currently the validator doesn't allow empty string:

linkify-plus-plus/src/lib/pref-body.js

Lines 89 to 91 in c79fc82

 function validateSelector(value) { 
   document.documentElement.matches(value); 
 }