Prevent panic in fetchBrandingSettingsOrUseDefaults

[sergiught]

🔧 Changes

As pointed out in #515 (comment), the ul templates update command panics in case there are no branding settings returned by the API and no error.

This PR prevents that from occuring.

📚 References

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ac090d1) 70.59% compared to head (a1af28c) 70.59%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #731   +/-   ##
=======================================
  Coverage   70.59%   70.59%           
=======================================
  Files          87       87           
  Lines       11183    11183           
=======================================
  Hits         7895     7895           
  Misses       2775     2775           
  Partials      513      513           

Impacted Files	Coverage Δ
internal/cli/universal_login_templates.go	46.09% <100.00%> (ø)

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