Ensures that any hex color is properly hashed.

Otherwise, returns value untouched.

This method should only be necessary if using sanitize_hex_color_no_hash().

function maybe_hash_hex_color( $color ) {
	$unhashed = sanitize_hex_color_no_hash( $color );
	if ( $unhashed ) {
		return '#' . $unhashed;
	}

	return $color;
}