Fix: import script creates empty "husk" members

[Andrew-Dickinson]

Closes #505 by removing the empty member objects that sometimes get created when we are unable to parse an address due to spam or international submissions

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.03%. Comparing base (3e0a0e3) to head (670d697). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #633 +/- ## ======================================= Coverage 94.03% 94.03% ======================================= Files 75 75 Lines 3086 3086 ======================================= Hits 2902 2902 Misses 184 184 ```

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