connected buses

Signed-off-by: Guthrie Adams <guthadam@amazon.com>

Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialSystemComponent.cpp

@@ -95,6 +95,7 @@ namespace AZ
 
         void EditorMaterialSystemComponent::Activate()
         {
+            AZ::EntitySystemBus::Handler::BusConnect();
             EditorMaterialSystemComponentNotificationBus::Handler::BusConnect();
             EditorMaterialSystemComponentRequestBus::Handler::BusConnect();
             AzToolsFramework::AssetBrowser::AssetBrowserInteractionNotificationBus::Handler::BusConnect();
@@ -106,6 +107,7 @@ namespace AZ
 
         void EditorMaterialSystemComponent::Deactivate()
         {
+            AZ::EntitySystemBus::Handler::BusDisconnect();
             EditorMaterialSystemComponentNotificationBus::Handler::BusDisconnect();
             EditorMaterialSystemComponentRequestBus::Handler::BusDisconnect();
             AzToolsFramework::AssetBrowser::AssetBrowserInteractionNotificationBus::Handler::BusDisconnect();