fix: Allow admin/organizer to edit/add sessions without speaker call

[iamareebjamal]

even when speaker call is not present

[codecov]

Codecov Report

Merging #7440 (71ae20c) into development (3d70017) will decrease coverage by 0.01%.
The diff coverage is 25.00%.

@@               Coverage Diff               @@
##           development    #7440      +/-   ##
===============================================
- Coverage        65.29%   65.28%   -0.02%     
===============================================
  Files              265      265              
  Lines            13217    13223       +6     
===============================================
+ Hits              8630     8632       +2     
- Misses            4587     4591       +4     

Impacted Files	Coverage Δ
app/api/helpers/speaker.py	76.92% <25.00%> (-13.08%)	⬇️
app/templates/flask_ext/jinja/filters.py	76.00% <0.00%> (-5.82%)	⬇️
app/api/events.py	38.91% <0.00%> (ø)

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