NullPointerException when kickstarting FusionAuth following MaintenanceModeUpgrade

[bguyza]

NullPointerException when kickstarting FusionAuth following MaintenanceModeUpgrade

Description

When spinning up FusionAuth, if we enter maintenance mode first, kickstart is suspended until the user completes a task such as a search index upgrade.

Once this is completed, the initial http request (ie. https://localhost:9011/) executes immediately after kickstart. This is problematic if the default tenant Id is being updated in the synchronous portion of kickstart because the caches are not refreshed fast enough for the next call on the stack.

This results in a NullPointerException.

Affects versions

= 1.30.2

Steps to reproduce

Steps to reproduce the behavior:

1. Create new database
2. Delete the search index
3. Run FusionAuth

Expected behavior

We should not run into any errors when starting up.

[robotdan]

Merged PRs, and I'll resolve comments and then move this to code complete.