Drawers secondary nav bug

[alexdamsted]

Describe the bug
This is a bug when accessing the /backup/view.php page of a given course.

It seems that the drawers secondary nav related code is not error guarded resulting in the bug.

This may be a workaround to a Moodle core bug instead? I can replicate this problem with theme_boost too.

To Reproduce
Steps to reproduce the behavior:

1. Access your Moodle site and going to the /backup/view.php page of a given course.
2. I couldn't seem to replicate this as a siteadmin but rather just as a normal user with course editing/backup/restore permissions.
3. See the below fatal error output:

Error Exception
---------------
core\output\url_select::__construct():
Argument #1 ($urls) must be of type array, null given

Debug info:
Error code: generalexceptionmessage

Stack trace:
------------
#0 /lib/classes/output/url_select.php:110
   TypeError thrown

#1 /lib/classes/navigation/views/secondary.php:639
   call to core\output\url_select->__construct()

#2 /theme/boost_union/layout/drawers.php:121
   call to core\navigation\views\secondary->get_overflow_menu_data()

#3 /lib/classes/output/core_renderer.php:972
   call to include()

#4 /lib/classes/output/core_renderer.php:888
   call to core\output\core_renderer->render_page_layout()

#5 /lib/classes/output/core_renderer.php:824
   call to core\output\core_renderer->header()

#6 /theme/boost_union/classes/output/core_renderer.php:?
   call to theme_boost_union\output\core_renderer->header()

#7 /lib/classes/output/bootstrap_renderer.php:109
   call to call_user_func_array()

#8 /backup/view.php:50
   call to core\output\bootstrap_renderer->__call()

---

Expected behavior

1. The /backup/view.php of a given course should load normally.

Please complete the following information:

• Moodle Version: 4.5
• Boost Union Version: MOODLE_405_STABLE
• OS: [e.g. Windows, Android, iOS]: Windows
• Browser [e.g. firefox, safari]: Chrome