Is it possible to have a blank option for editor select box

matt_rumsey1212

So I am using an editor select box within Editor. The dropdown displays options from the database using a left join. What I would like to know is if it is possible to have a blank field as the default. The field in question is an optional field that will more than likely be initially set to null.

{
    "label": "Team",
    "name": "Agent.Team_id",
    "type": "select"
}