How can i restrict/allow specific node to have Unconnected Links

@ptag wrote:

This is my diagram configuration FYI.

myDiagram = $$(go.Diagram, "diagram",  
{ 
    initialContentAlignment: go.Spot.Center, 
    scrollMode: go.Diagram.InfiniteScroll,
    allowDrop: true, 
    "undoManager.isEnabled": true,
    contextMenu: myDiagramContextMenu,
    **"linkingTool.isUnconnectedLinkValid": true,**

** “linkingTool.portGravity”: 20,**
** “relinkingTool.isUnconnectedLinkValid”: true,**
** “relinkingTool.portGravity”: 20,**
“relinkingTool.fromHandleArchetype”:
$$(go.Shape, “Diamond”, { segmentIndex: 0, cursor: “pointer”, desiredSize: new go.Size(8, 8), fill: “tomato”, stroke: “darkred” }),
“relinkingTool.toHandleArchetype”:
$$(go.Shape, “Diamond”, { segmentIndex: -1, cursor: “pointer”, desiredSize: new go.Size(8, 8), fill: “darkred”, stroke: “tomato” }),
“linkReshapingTool.handleArchetype”:
$$(go.Shape, “Diamond”, { desiredSize: new go.Size(7, 7), fill: “lightblue”, stroke: “deepskyblue” }),
“commandHandler.pasteFromClipboard”: function(){
var curOffset = go.CommandHandler.prototype.pasteFromClipboard.call(this);
var newOffset = new go.Point(20, 20);
this.diagram.moveParts(curOffset, newOffset);
}
});

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