Fixed a null pointer exception with DebugMenu State at runtime.

Assets/ScriptableRenderPipeline/Core/Debugging/DebugMenuManager.cs

             m_UpdateFromItemStateRequired = true;
         }
 
+        // debug state will be null at runtime.
-            return m_DebugMenuState.FindDebugItemState(itemName, menuName);
+            return (m_DebugMenuState != null) ? m_DebugMenuState.FindDebugItemState(itemName, menuName) : null;
-            m_DebugMenuState.AddDebugItemState(state);
+            if(m_DebugMenuState != null)
+                m_DebugMenuState.AddDebugItemState(state);
         }
 
         public DebugPanel GetDebugPanel(int index)

Assets/ScriptableRenderPipeline/Core/Debugging/DebugPanel.cs

                 m_Handler.ClampValues(m_Getter, m_Setter);
 
                 // Update state for serialization/undo
-                if(record)
+                if(record && m_State != null)
                     m_State.SetValue(m_Getter());
             }
         }