Removing nav menu panel in Customizer causes PHP notice

[ericlewis]

I'm removing the nav menu panel contextually for a minimalist Customizer experience.

If you remove the nav menu panel, the ​l10n configuration breaks because it directly attempts to get the title from the nav menu panel object.

e.g.

<?php
add_action( 'customize_register', function($manager) {
        global $wp_customize;

        foreach ( $wp_customize->panels() as $key => $panel ) {
                $wp_customize->remove_panel( $key );
        }

        foreach ( $wp_customize->sections() as $key => $section ) {
                $wp_customize->remove_section( $key );
        }

}, 50, 1 );

[SergeyBiryukov]

Duplicate of #33411.