Min-length="0" is not working as expected

[deje1011]

Hi there,
Thank you for developing this component!
I tried using ngTagsInput to select items with a property called "displayString". This property may be empty, so my template provides a default value:
{{::data.displayString || 'No name'}

Those items are displayed inside the autocomplete list but cannot be selected, even though min-length is set to 0 and allowed-tags-pattern is set to .*.
So I had a look in the source code and saw that it will never accept empty strings:

ngTagsInput/src/tags-input.js

Line 69 in 87d0e6b

let valid = tagText &&

Would it be possible to remove that check?
Thanks a lot,
Jesse