CLS2-1069 Fix marketing data ingestion bug

[samuele-mattiuzzo]

Description of change

We have found that no marketing data has been ingested since the release of the ingestion tasks in (v50.24.0)

The job fails when trying to access a non-existent key in the JSON.

This PR addresses that bug and makes sure the key isn't accessed directly via dict[] but relies on get() instead

Checklist

• Has this branch been rebased on top of the current main branch?

  Explanation

  The branch should not be stale or have conflicts at the time reviews are requested.

• Is the CircleCI build passing?

General points

Other things to check

• Make sure fixtures/test_data.yaml is maintained when updating models
• Consider the admin site when making changes to models
• Use select-/prefetch-related field lists in views and search apps, and update them when fields are added
• Make sure the README is updated e.g. when adding new environment variables

See docs/CONTRIBUTING.md for more guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.50%. Comparing base (91c9bf7) to head (cce98ec).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5830   +/-   ##
=======================================
  Coverage   96.50%   96.50%           
=======================================
  Files        1042     1042           
  Lines       24754    24754           
  Branches     1645     1645           
=======================================
+ Hits        23888    23889    +1     
+ Misses        710      709    -1     
  Partials      156      156           

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