Fix check for empty dependencies on admin bar style loader tag filter

[Takshil-Kunadia]

Summary

Fixes #7766

• Added check for empty since deps is a non-nullable property of WP_Styles.

Checklist

• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

[westonruter]

Alternatively:

		$admin_bar_dep = wp_styles()->query( 'admin-bar', 'registered' );
		if (
			$admin_bar_dep && in_array( $handle, $admin_bar_dep->deps, true ) ?
				self::is_exclusively_dependent( wp_styles(), $handle, 'admin-bar' ) :
				self::has_dependency( wp_styles(), $handle, 'admin-bar' )

[Takshil-Kunadia]

yes, much better.

[Takshil-Kunadia]

Also we don't need to pass status param in query() as the default value is 'registered'.

[Takshil-Kunadia]

Should we add the same checks here as well?

amp-wp/includes/class-amp-theme-support.php

Lines 1404 to 1414 in 79b1b7a

	public static function filter_customize_preview_style_loader_tag( $tag, $handle ) {
	$customize_preview = 'customize-preview';
	if (
	is_array( wp_styles()->registered[ $customize_preview ]->deps ) && in_array( $handle, wp_styles()->registered[ $customize_preview ]->deps, true )
	? self::is_exclusively_dependent( wp_styles(), $handle, $customize_preview )
	: self::has_dependency( wp_styles(), $handle, $customize_preview )
	) {
	$tag = preg_replace( '/(?<=<link)(?=\s|>)/i', ' ' . AMP_Rule_Spec::DEV_MODE_ATTRIBUTE, $tag );
	}
	return $tag;

amp-wp/includes/class-amp-theme-support.php

Lines 1426 to 1435 in 79b1b7a

	public static function filter_admin_bar_script_loader_tag( $tag, $handle ) {
	if (
	is_array( wp_scripts()->registered['admin-bar']->deps ) && in_array( $handle, wp_scripts()->registered['admin-bar']->deps, true ) ?
	self::is_exclusively_dependent( wp_scripts(), $handle, 'admin-bar' ) :
	self::has_dependency( wp_scripts(), $handle, 'admin-bar' )
	) {
	$tag = preg_replace( '/(?<=<script)(?=\s|>)/i', ' ' . AMP_Rule_Spec::DEV_MODE_ATTRIBUTE, $tag );
	}
	return $tag;
	}

[westonruter]

@Takshil-Kunadia sure, sounds good!