Patterns: fix bug with Create Patterns menu not showing in site edito…

…r page editing (#52671)

* Pass the root client id into the reusable blocks menu

* Check that clientIds array is defined

* Make check for array item more specific

packages/reusable-blocks/src/components/reusable-blocks-menu-items/index.js

@@ -25,8 +25,14 @@ function ReusableBlocksMenuItems( { clientIds, rootClientId } ) {
 }
 
 export default withSelect( ( select ) => {
-	const { getSelectedBlockClientIds } = select( blockEditorStore );
+	const { getSelectedBlockClientIds, getBlockRootClientId } =
+		select( blockEditorStore );
+	const clientIds = getSelectedBlockClientIds();
 	return {
-		clientIds: getSelectedBlockClientIds(),
+		clientIds,
+		rootClientId:
+			clientIds?.length > 0
+				? getBlockRootClientId( clientIds[ 0 ] )
+				: undefined,
 	};
 } )( ReusableBlocksMenuItems );