Fixed hiding of right pane when there are no outputs

Also removed some unnecessary classList checks

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/Drawer/NodeDrawer.cs

             var anchors = nodeData.elements.OfType<AnchorDrawData>().ToList();
 
             if (anchors.Count == 0)
+            {
+                m_RightContainer.AddToClassList("empty");
+            }
-            {
-            }
+
+            int outputCount = 0;
+                {
+                }
+                {
+                    outputCount++;
+                }
+
+            if (outputCount == 0)
+                m_RightContainer.AddToClassList("empty");
+            else
+                m_RightContainer.RemoveFromClassList("empty");
-
-            if (controlDrawData.Count == 0)
-            {
-                if (!m_RightContainer.classList.Contains("empty"))
-                    m_RightContainer.AddToClassList("empty");
-                return;
-            }
-
-            m_RightContainer.RemoveFromClassList("empty");
 
             if (!nodeData.expanded)
             {
             }
 
             if (!nodeData.expanded)
-            {
-                if (!classList.Contains("collapsed"))
-                    AddToClassList("collapsed");
-            }
+                AddToClassList("collapsed");
-            {
-                if (classList.Contains("collapsed"))
-                    RemoveFromClassList("collapsed");
-            }
+                RemoveFromClassList("collapsed");
 
             AddHeader(nodeData);
             AddSlots(nodeData);