Can add a null item to the grid

[StefanoChiodino]

Grid allows to enter null values instead of a grid element by pressing enter.

Reproduction

Specifics

Umbraco v12.3

Steps to reproduce

• Find a page with a grid
• Click to add an element to the grid
• Instead of clicking on a type just press enter

Expected result

Nothing happens

Actual result

A new item in the grid is created with the text:

Something went wrong with this editor, below is the data stored:

{
"value": null,
"active": true
}

[nul800sebastiaan]

Fixed in https://github.com/umbraco/Umbraco-CMS/pull/3146