WS-523: Make `productfetcher` not explode on null subdirectory value

Nathan Hertzrequested to merge
productfetcher-subdirectory-null-handling into main
  • Fixed failing on null subdirectory value
  • Added a default value validator that will fill in subdirectory if it's None
  • test
  • Ran successful download of VLBA product
Edited by Nathan Hertz

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