fix: Delete complex field values if empty

[iamareebjamal]

For fossasia/open-event-server#7164

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[niranjan94]

Here is an overview of what got changed by this pull request:

Complexity increasing per file
==============================
- app/serializers/session.js  2
         

See the complete overview on Codacy

[codecov]

Codecov Report

Merging #4665 into development will decrease coverage by 0.04%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #4665      +/-   ##
===============================================
- Coverage        23.08%   23.03%   -0.05%     
===============================================
  Files              475      476       +1     
  Lines             4952     4962      +10     
  Branches             8        8              
===============================================
  Hits              1143     1143              
- Misses            3808     3818      +10     
  Partials             1        1              

Impacted Files	Coverage Δ
app/serializers/session.js	0.00% <0.00%> (ø)
app/controllers/events/view.js	0.00% <0.00%> (ø)
app/components/public/call-for-speakers.js	0.00% <0.00%> (ø)
app/components/modals/cfs-proposal-modal.js
app/components/modals/publish-unpublish-modal.js	0.00% <0.00%> (ø)

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