Renders an additional non active input field

[mishapankin]

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.