Fix php notice when a container is disabled for all profiles

[AdrienClairembault]

Fix this notice:

PHP Notice: Trying to access array offset on value of type null

This is caused by the result of array_shift($found); being null.

https://www.php.net/manual/en/function.array-shift.php

Returns the shifted value, or null if array is empty or is not an array.

-> the following condition should take into account that the variable may be null.