user-edit.php doesn't do user exist check

[Viper007Bond]

Visit /wp-admin/user-edit.php?user_id=1337 on your test install. No error will display even though the user doesn't (probably) exist.

[mrmist]

Based on wp-admin/user-edit.php 2.6 version

[mrmist]

based on wp-admin/includes/user.php 2.6 version

[mrmist]

My attempt at this - adds a function check_user_id($id) which checks in the users database and returns the id that matches (if the user exists) or an empty set. Then adds logic to user_edit to check the id passed using the function.

If the user id does not exist, the page calls wp_die.

Strictly, the logic doing the test before the wp_die is unnecessary, as the immediately following block of code will pick up the empty id, but I thought it best to include the check so that the test is self-sufficient.

In IE7 with pretty errors enabled, you get a internal server error not the wp_die message.

[ryan]

(In [9135]) Die if invalid user ID passed to user-edit.php. fixes #7291