ChipList allow to set null or empty string instead of undefined when nothing select · Issue #18409 · angular/components · GitHub
![Best Way to Check 'Null', 'Undefined' or 'Empty' in JavaScript | JavaScript Tutorial for Beginners - YouTube Best Way to Check 'Null', 'Undefined' or 'Empty' in JavaScript | JavaScript Tutorial for Beginners - YouTube](https://i.ytimg.com/vi/8E3-wx4Vw24/maxresdefault.jpg)
Best Way to Check 'Null', 'Undefined' or 'Empty' in JavaScript | JavaScript Tutorial for Beginners - YouTube
Setting an empty string instead of null or empty object when editable is false · Issue #3176 · angular-ui/bootstrap · GitHub
![angular - TS2345: Argument of type 'string | null' is not assignable to parameter of type 'string | UrlTree' - Stack Overflow angular - TS2345: Argument of type 'string | null' is not assignable to parameter of type 'string | UrlTree' - Stack Overflow](https://i.stack.imgur.com/ThNDx.png)