[Bug] Properties / inputs without default value show "" as default value

[Yogu]

If a property has no default value, the "Default" column shows "". Instead, it should somehow indicate that there is no default value, e.g. leave the cell blank.

[Etienne-Buschong]

I will need to double check what we actually write in the defaultField in such cases ("" or undefined). It may be possible that this out of the scope of this plugin, since we use the ArgsTable-react-component to render the types (which is not part of this repo).

[Etienne-Buschong]

I just checked it again. The ArgsTable requires that a string is entered, so this is nothing that we can change on our side.
Would it be an okay-ish solution to explicitly write something like "No default value", or would this be too verbose?