Update 'src/app/components/middle-point/drawers/middle-point-drawer.js'

Details in debug message in "drawByStates (konvaObject)" that was launching error
"TypeError: aggregator is undefined", when try to create MidPoint of MidPoint.
Was necessary to introduce "aggregator!=undefined ?" in:
   aux += " (1) aggregator.id=" + (aggregator!=undefined ? aggregator.id : "<>") + "; ";

src/app/components/middle-point/drawers/middle-point-drawer.js

@@ -121,7 +121,7 @@ console.log(" * 7. this.middlePoint.id="+(this.middlePoint&&this.middlePoint.id?
       var aux = "";
       if (konvaObject != undefined) {
         aggregator = Objects.getByKonvaObject(konvaObject)[0];
-        aux += " (1) aggregator.id=" + aggregator.id + "; ";
+        aux += " (1) aggregator.id=" + (aggregator!=undefined ? aggregator.id : "<>") + "; ";
         }
       if (this.state == undefined) {
         super.setState(MiddlePointDrawer.FIRST_POINT_STATE);