fix: OPTIC-1490: Safely reference content_type of the response so it does not error

[bmartel]

PR fulfills these requirements

• Commit message(s) and PR title follows the format [fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made ex. fix: DEV-XXXX: Removed inconsistent code usage causing intermittent errors
• Tests for the changes have been added/updated (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• Best efforts were made to ensure docs/code are concise and coherent (checked for spelling/grammatical errors, commented out code, debug logs etc.)
• Self-reviewed and ran all changes on a local instance (for bug fixes/features)

Change has impacts in these area(s)

(check all that apply)

• Product design
• Backend (Database)
• Backend (API)
• Frontend

Describe the reason for change

There will be cases where the response has no content_type, which is the case of NotFound response objects. This just makes sure it is present before reading it.

Which logical domain(s) does this change affect?

ContextLog

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.79%. Comparing base (e320bbe) to head (2ea604a).
Report is 6 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6856   +/-   ##
========================================
  Coverage    76.79%   76.79%           
========================================
  Files          171      171           
  Lines        14030    14030           
========================================
+ Hits         10774    10775    +1     
+ Misses        3256     3255    -1     

Flag	Coverage Δ
pytests	76.79% <100.00%> (+<0.01%)	⬆️

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