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On creating or editing an entity in BookBrainz (see a creation form), when a user clicks on the "Add identifiers" link, when the identifier editor popup opens, it should have an empty field added by default to save clicking on the "Add Identifier" button.

Follow the instructions on the BookBrainz site github repo to run a local development environment. When you are satisfied with your code, create a pull request ("PR"), comment on this task with a link to the PR that we will review.