Undefined Index ID in customizer on post delete with customize-posts plugin

[mohdsayed]

When trashing a post in customizer with customize-posts plugin, stream causes this error

Notice: Undefined index: ID in /srv/www/wp.dev/docroot/wp-content/plugins/stream/classes/class-alerts-list.php on line 341

Its because customize-posts plugin is invoking wp_insert_post_data filter again and overriding $postarr to $unsanitized_post_data.
https://github.com/xwp/wp-customize-posts/blob/develop/php/class-wp-customize-post-setting.php#L474

So when Alerts_List::save_alert_inline_edit hooked to wp_insert_post_data is called it does not get $postarr['ID'] hence causing the above error.

https://github.com/xwp/stream/blob/develop/classes/class-alerts-list.php#L341