(stable) Fix two cache issues (global settings; initial setup)

Summary:

• Fixes T11995. This got moved but I missed renaming this callsite.
• Fixes T11993. If you have valid credentials, but haven't run storage upgrade yet, we can hit this exception during setup. Just ignore it instead.

Test Plan:

• Saved global settings, no more fatal.
• Changed storage-namespace to junk, loaded web UI with valid database credentials.

{F2106358}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11993, T11995

Differential Revision: https://secure.phabricator.com/D17024