[field-components] MultiUrlField - Handle not-url values correctly

[mguihal]

Hello,

There is currently a bug inside MultiUrlField when value given is not a valid url (or valid urls array). The URL constructor returns an exception in that case which was not catched, causing global error on the page.

I updated the component to display the not-url value in that case (possible in Archipelago because there is no validation on edit forms)

[mguihal]

@srosset81 you didn't approve this PR. Was it ok for you? Can I merge it?

[srosset81]

Yes sure !