Node image is not correctly scaled when the "size" attribute is missing

[szydan]

This does not work

var n1 =  {id: "article", label: "article", nodeType: "article"};

minNodeSize: 30
nodeIcons: {
                article: "newspaper.png"
}

While this does

var n1 =  {id: "article", label: "article", nodeType: "article", size: 30};

minNodeSize: 30
nodeIcons: {
                article: "newspaper.png"
}