GLTFExporter: Replace if ( object.name ) with if ( object.name !== '' ) for the code consistency

examples/js/exporters/GLTFExporter.js

@@ -1087,7 +1087,7 @@ THREE.GLTFExporter.prototype = {
 			}
 
 			// We don't export empty strings name because it represents no-name in Three.js.
-			if ( object.name ) {
+			if ( object.name !== '' ) {
 
 				gltfNode.name = String( object.name );