Handle nodes without any output

The right container simply isn't shown in this case.

Signed-off-by: joce <joce@unity3d.com>

MaterialGraphProject/Assets/NewUI/Editor/Demo/Views/Presenters/NodesContentViewPresenter.cs

 			inputNodeAnchorPresenter.anchorType = typeof(Color);
 			nodePresenter.inputAnchors.Add(inputNodeAnchorPresenter);
 
-			var outputNodeAnchorPresenter = CreateInstance<OutputNodeAnchorPresenter>();
-			outputNodeAnchorPresenter.anchorType = outputType;
-			nodePresenter.outputAnchors.Add(outputNodeAnchorPresenter);
+			if (outputType != null)
+			{
+				var outputNodeAnchorPresenter = CreateInstance<OutputNodeAnchorPresenter>();
+				outputNodeAnchorPresenter.anchorType = outputType;
+				nodePresenter.outputAnchors.Add(outputNodeAnchorPresenter);
+			}
 
 			return nodePresenter;
 		}
 			// This is a demo, so our data (and thus our presenters) is fixed.
 
 			var containerPresenter = CreateInstance<InvisibleBorderContainerPresenter>();
-			containerPresenter.position = new Rect(630.0f, 0.0f, 200.0f, 200.0f);
+			containerPresenter.position = new Rect(850, 320, 200, 200);
-			containerPresenter.position = new Rect(630.0f, 210.0f, 200.0f, 200.0f);
+			containerPresenter.position = new Rect(1070, 320, 200, 200);
-			circlePresenter.position = new Rect(630, 420, 0, 0);
+			circlePresenter.position = new Rect(630, 320, 0, 0);
 			circlePresenter.radius = 200;
 			AddElement(circlePresenter);
 
 			nodePresenter = InitNodePresenter(typeof(float));
 			nodePresenter.position = new Rect(0, 186, 200, 176);
 			nodePresenter.title = "Another Operator";
+			AddElement(nodePresenter);
+
+			nodePresenter = InitNodePresenter(null);
+			nodePresenter.position = new Rect(600, 0, 200, 176);
+			nodePresenter.title = "No Output";
 			AddElement(nodePresenter);
 
 			var verticalNodePresenter = InitVerticalNodePresenter();

MaterialGraphProject/Assets/NewUI/Editor/Elements/Node.cs

 				m_InputContainer.AddChild(NodeAnchor.Create<EdgePresenter>(anchorPresenter));
 			}
 
+			bool hasOutput = false;
+				hasOutput = true;
+			}
+
+			// Show output container only if we have one or more child
+			if (hasOutput)
+			{
+				if (!m_MainContainer.children.Contains(m_RightContainer))
+				{
+					m_MainContainer.InsertChild(0, m_RightContainer);
+				}
+			}
+			else
+			{
+				if (m_MainContainer.children.Contains(m_RightContainer))
+				{
+					m_MainContainer.RemoveChild(m_RightContainer);
+				}
 			}
 
 			m_TitleLabel.content.text = nodePresenter.title;
 		public Node()
 		{
 			m_MainContainer = new VisualContainer()
- 			{
- 				name = "pane",
- 				pickingMode = PickingMode.Ignore,
- 			};
+			{
+				name = "pane",
+				pickingMode = PickingMode.Ignore,
+			};
 			m_LeftContainer = new VisualContainer
 			{
 				name = "left",

MaterialGraphProject/Assets/NewUI/Editor/Views/GraphView.uss

 .node #left > #title > Button {
 	text-color: rgb(153, 153, 153);
 	flex: 1;
+	margin-right: 6;
+	padding-right: 0;
+	padding-left: 0;
+	text-alignment: middle-center;
 }
 
 .node.horizontal #left > #input {