fix: Check session and speaker available for side-menu

[iamareebjamal]

Fixes #4804

[vercel]

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[codecov]

Codecov Report

Merging #4848 into development will decrease coverage by 0.07%.
The diff coverage is 11.11%.

@@               Coverage Diff               @@
##           development    #4848      +/-   ##
===============================================
- Coverage        23.36%   23.29%   -0.08%     
===============================================
  Files              480      480              
  Lines             5075     5082       +7     
  Branches            16       16              
===============================================
- Hits              1186     1184       -2     
- Misses            3886     3895       +9     
  Partials             3        3              

Impacted Files	Coverage Δ
app/components/public/side-menu.js	0.00% <0.00%> (ø)
app/routes/public/speakers.js	33.33% <50.00%> (+33.33%)	⬆️
app/components/tabbed-navigation.js	33.33% <0.00%> (-20.00%)	⬇️

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