Renders an additional non active input field

If editor has no initial input data, then after pressing **enter** in an empty input field there is created an addition not intended input field which does nothing.

### How to reproduce:

1. Delete data object from **new EditorJS** in the example.html
2. In browser, press **tab** twice and then **enter** to create image input field
3. Press **enter** again

Result looks like this:
But pasting image url into the second field does nothing.

Open example.html and reproduce the empty-editor sequence in a browser: press Tab twice, Enter to create the image input, then Enter again. Trace the handling of the additional input field and verify that pressing Enter does not create a non-functional field; pasting an image URL should continue to work in the intended field.

Written by the indexing model from the issue text.