natvis: minor changes

natvis/entt/container.natvis

@@ -7,7 +7,7 @@
 			<Item Name="[bucket_count]">sparse.first_base::value.size()</Item>
 			<Item Name="[load_factor]">(float)packed.first_base::value.size() / (float)sparse.first_base::value.size()</Item>
 			<Item Name="[max_load_factor]">threshold</Item>
-			<IndexListItems Optional="true" Condition="packed.first_base::value.size() != 0">
+			<IndexListItems Condition="packed.first_base::value.size() != 0">
 				<Size>packed.first_base::value.size()</Size>
 				<ValueNode>packed.first_base::value[$i].element</ValueNode>
 			</IndexListItems>
@@ -20,7 +20,7 @@
 			<Item Name="[bucket_count]">sparse.first_base::value.size()</Item>
 			<Item Name="[load_factor]">(float)packed.first_base::value.size() / (float)sparse.first_base::value.size()</Item>
 			<Item Name="[max_load_factor]">threshold</Item>
-			<IndexListItems Optional="true" Condition="packed.first_base::value.size() != 0">
+			<IndexListItems Condition="packed.first_base::value.size() != 0">
 				<Size>packed.first_base::value.size()</Size>
 				<ValueNode>packed.first_base::value[$i].element</ValueNode>
 			</IndexListItems>