Deprecated function with PHP 8.2 & 8.3

Hello,

I shall let you know that current version of your plugin uses at least one deprecated function in PHP 8.2 and 8.3.

Visiting plugins page (/wp-admin/plugins.php) with WP Query Monitor extension enabled, shows the following error:

Deprecated Message:
ltrim(): Passing null to parameter #1 ($string) of type string is deprecated

Location:
wp-includes/formatting.php:4494
ltrim()
wp-includes/formatting.php:4494
esc_url()
wp-content/plugins/og/includes/iworks/rate/rate.php:119
iworks_rate->add_donate_link()
wp-includes/class-wp-hook.php:324
apply_filters('plugin_action_links_og/og.php')
wp-admin/includes/class-wp-plugins-list-table.php:985
WP_Plugins_List_Table->single_row()
wp-admin/includes/class-wp-plugins-list-table.php:706
WP_Plugins_List_Table->display_rows()
wp-admin/includes/class-wp-list-table.php:1709
WP_List_Table->display_rows_or_placeholder()
wp-admin/includes/class-wp-list-table.php:1636
WP_List_Table->display()
wp-admin/plugins.php:796

Plugin: og

In order to avoid getting such error, and to prepare for future PHP versions, it would be a great thing to adapt the code in order to fit newer PHP versions.

Best regards

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