PIPELINE-1860 Discard positions with null lat or lon

[rdgfuentes]

https://globalfishingwatch.atlassian.net/browse/PIPELINE-1860

[nx-cloud]

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✅ Successfully ran 2 targets

• nx run-many --target=test --exclude=libs-bigquery,libs-logger
• nx run-many --target=install

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@            Coverage Diff             @@
##             develop      #17   +/-   ##
==========================================
  Coverage           ?   75.65%           
==========================================
  Files              ?       27           
  Lines              ?      382           
  Branches           ?       36           
==========================================
  Hits               ?      289           
  Misses             ?       90           
  Partials           ?        3           

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