fix: Render drawers bar if only global drawers are present

[just-boris]

Description

When only global drawers are present, the panel still should render

Related links, issue #, if available: AWSUI-59981

How has this been tested?

Locally. More tests later

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.30%. Comparing base (31cd27d) to head (01a925d).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3006    +/-   ##
========================================
  Coverage   96.30%   96.30%            
========================================
  Files         777      777            
  Lines       21874    21881     +7     
  Branches     7470     7074   -396     
========================================
+ Hits        21066    21073     +7     
- Misses        755      800    +45     
+ Partials       53        8    -45     

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[just-boris]

Cannot approve my own PR, but feel free to merge this, all good by me