Merge remote-tracking branch 'upstream/stabilization/2110' into nvsickle/StabToDevNov21

Signed-off-by: Nicholas Van Sickle <nvsickle@amazon.com>

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabFocusHandler.cpp

@@ -175,20 +175,14 @@ namespace AzToolsFramework::Prefab
         m_focusedInstance = focusedInstance;
         m_focusedTemplateId = focusedInstance->get().GetTemplateId();
 
-        AZ::EntityId containerEntityId;
-
-        if (focusedInstance->get().GetParentInstance() != AZStd::nullopt)
-        {
-            containerEntityId = focusedInstance->get().GetContainerEntityId();
-        }
-        else
-        {
-            containerEntityId = AZ::EntityId();
-        }
-            
         // Focus on the descendants of the container entity in the Editor, if the interface is initialized.
         if (m_focusModeInterface)
         {
+            const AZ::EntityId containerEntityId =
+                (focusedInstance->get().GetParentInstance() != AZStd::nullopt)
+                ? focusedInstance->get().GetContainerEntityId()
+                : AZ::EntityId();
+
             m_focusModeInterface->SetFocusRoot(containerEntityId);
         }
 

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabPublicHandler.cpp

@@ -1144,6 +1144,10 @@ namespace AzToolsFramework
 
             AZ::EntityId firstEntityIdToDelete = entityIdsNoFocusContainer[0];
             InstanceOptionalReference commonOwningInstance = GetOwnerInstanceByEntityId(firstEntityIdToDelete);
+            if (!commonOwningInstance.has_value())
+            {
+                return AZ::Failure(AZStd::string("Cannot delete entities belonging to an invalid instance"));
+            }
 
             // If the first entity id is a container entity id, then we need to mark its parent as the common owning instance because you
             // cannot delete an instance from itself.