Revert "Avoid errors when a fontSize preset is not available (WordPre…

…ss#65791)"

This reverts commit 9bd9bd6.

packages/edit-site/src/components/global-styles/font-sizes/font-size.js

@@ -15,7 +15,7 @@ import {
 	ToggleControl,
 } from '@wordpress/components';
 import { moreVertical } from '@wordpress/icons';
-import { useState, useEffect } from '@wordpress/element';
+import { useState } from '@wordpress/element';
 
 /**
  * Internal dependencies
@@ -36,6 +36,7 @@ function FontSize() {
 
 	const {
 		params: { origin, slug },
+		goBack,
 		goTo,
 	} = useNavigator();
 
@@ -53,10 +54,10 @@ function FontSize() {
 
 	// Whether the font size is fluid. If not defined, use the global fluid value of the theme.
 	const isFluid =
-		fontSize?.fluid !== undefined ? !! fontSize.fluid : !! globalFluid;
+		fontSize.fluid !== undefined ? !! fontSize.fluid : !! globalFluid;
 
 	// Whether custom fluid values are used.
-	const isCustomFluid = typeof fontSize?.fluid === 'object';
+	const isCustomFluid = typeof fontSize.fluid === 'object';
 
 	const handleNameChange = ( value ) => {
 		updateFontSize( 'name', value );
@@ -106,6 +107,9 @@ function FontSize() {
 	};
 
 	const handleRemoveFontSize = () => {
+		// Navigate to the font sizes list.
+		goBack();
+
 		const newFontSizes = sizes.filter( ( size ) => size.slug !== slug );
 		setFontSizes( {
 			...fontSizes,
@@ -121,18 +125,6 @@ function FontSize() {
 		setIsRenameDialogOpen( ! isRenameDialogOpen );
 	};
 
-	// Navigate to the font sizes list if the font size is not available.
-	useEffect( () => {
-		if ( ! fontSize ) {
-			goTo( '/typography/font-sizes/', { isBack: true } );
-		}
-	}, [ fontSize, goTo ] );
-
-	// Avoid rendering if the font size is not available.
-	if ( ! fontSize ) {
-		return null;
-	}
-
 	return (
 		<>
 			<ConfirmDeleteFontSizeDialog