fix for sad labelless nodes

examples/network/01_basic_usage.html

@@ -23,7 +23,7 @@
     {id: 1, label: 'Node 1', value:3, title:'hello world'},
     {id: 2, label: 'Node 2', value:1, group:'bla'},
     {id: 3, label: 'Node 3', value:5},
-    {id: 4, label: 'Node 4', value:3},
+    {id: 4, value:3},
     {id: 5, label: 'Node 5', value:2}
   ];
 
@@ -44,7 +44,6 @@
     edges: edges
   };
   var options = {
-    configure:'nodes',
 //    physics:{barnesHut:{gravitationslPull:34}, solver:'banana'},
   }
   var network = new vis.Network(container, data, options);

lib/network/modules/components/Node.js

@@ -122,7 +122,7 @@ class Node {
     if (options.x !== undefined)     {this.x = parseInt(options.x); this.predefinedPosition = true;}
     if (options.y !== undefined)     {this.y = parseInt(options.y); this.predefinedPosition = true;}
     if (options.size !== undefined)  {this.baseSize = options.size;}
-    if (options.value !== undefined)  {options.value = parseInt(options.value);}
+    if (options.value !== undefined) {options.value = parseInt(options.value);}
 
     // this transforms all shorthands into fully defined options
     Node.parseOptions(this.options,options);
@@ -194,6 +194,9 @@ class Node {
   }
 
   updateLabelModule() {
+    if (this.options.label === undefined || this.options.label === null) {
+      this.options.label = '';
+    }
     this.labelModule.setOptions(this.options);
     if (this.labelModule.baseSize !== undefined) {
       this.baseFontSize = this.labelModule.baseSize;