fix: Handle exception while serialising session

[divs4debu]

Fixes #4706

Short description of what this resolves:

Changes proposed in this pull request:

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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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 #4707 into development will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           development    #4707      +/-   ##
===============================================
- Coverage        23.11%   23.08%   -0.04%     
===============================================
  Files              476      476              
  Lines             4975     4982       +7     
  Branches             8        8              
===============================================
  Hits              1150     1150              
- Misses            3824     3831       +7     
  Partials             1        1              

Impacted Files	Coverage Δ
app/components/forms/wizard/basic-details-step.js	24.39% <0.00%> (-0.31%)	⬇️
app/mixins/event-wizard.js	1.14% <0.00%> (-0.08%)	⬇️
app/serializers/session.js	0.00% <0.00%> (ø)

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