[BUG] GetPlan of empty collection throw exception

[mikhail-khalizev]

Version
5.0.8

Describe the bug
GetPlan method of empty collection throw System.InvalidOperationException : Sequence contains no elements.

Code to Reproduce

public class StateModel
{
    [BsonId]
    public int Id { get; set; }
}

[Fact]
public void MyTest()
{
    using (var db = new LiteDatabase(":memory:"))
    {
        var col = db.GetCollection<StateModel>("col");
        var query = col.Query();
        var plan = query.GetPlan();
    }
}

Expected behavior
Exception is not thrown.

[lbnascimento]

@mikhail-khalizev This issue has been fixed in master and its fix will be present in the next incremental release.