option/nullable values

[x37v]

In the Optional Attributes VALUE section there is a bullet point with this text:

If a query is performed for the "VALUE" attribute, but the OSC method does not yet have a value, the query should return an empty JSON object.

Does this mean that values are nullable? Is there an example server that does this? I tried libossia and it seems that if sets values to a default on creation. Would the TYPE for the given method change once a value is set?