Allow ingesting of EYB Leads without full name set

[marijnkampf]

Allow ingesting of EYB Leads without full name set. Empty full name values default to 'Not set'

Description of change

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 96.64%. Comparing base (0642315) to head (04ee5f0).
Report is 17 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5880   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files        1059     1059           
  Lines       25201    25206    +5     
  Branches     1669     1670    +1     
=======================================
+ Hits        24356    24361    +5     
  Misses        689      689           
  Partials      156      156           

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