If a slime model is selected for custom mob, mob is not added to the workspace

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Status

Fixed

Issue description

If a mob with Slime model is made, MCreator does not add the element to the mod element list as the mod creation window crashes. The video of the bug (credit goes to the user Schneebeere): https://www.youtube.com/watch?v=5Vzx1zKGzMw

Workaround: When a slime model is selected, set its size manually to 1x1 even though these numbers are already entered in the boxes.