[BI-2055] - Remove missingValueString tablesaw values

[HMS17]

Description

Story: BI-2055 - Remove missingValueString tablesaw values

Default tablesaw behavior silently converts certain values to an empty string when processing tables, which can lead to unexpected behavior when importing files in DeltaBreed. This follows up on work implemented in BI-1993 to also remove this silent conversion for N/A, NaN, *, and null values and update associated tests. Since before this card any of the aforementioned values would be converted to null, this revealed some unexpected behavior in downstream workflows processing said values, which this part of the card addressed.

Dependencies

tablesaw: bug/BI-2055 (should be merged into master before this card is tested to avoid a great deal of pain)

Testing

For both the new experiment and append/overwrite workflows

• Upload a file that has the following values (N/A, NaN, *, null) for each ontology term scale class
  • Confirm that appropriate error appears for numerical, date, ordinal, and nominal scale classes when N/A, NaN, *, and null are observation inputs
  • Confirm that no error appears for cells with free text values with N/A, NaN, and *
  • Confirm that "'Null' is not a valid value" error appears for cells with free text value of null
• Upload a file with just N/A, NaN, and * values for a free text ontology term
  • Confirm that import preview loads and displays correct values for free text terms
  • Complete upload and ensure that free text terms display in experiment and observations table

Smoke test other upload workflows as a sanity measure

Checklist:

• I have performed a self-review of my own code
• I have tested my code and ensured it meets the acceptance criteria of the story
• I have tested that my code works with both the brapi-java-server and BreedBase
• I have create/modified unit tests to cover this change
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to documentation
• I have run TAF: _<please include a link to TAF run>_

[mlm483]

Tested, working.

I left one suggested change to clean up a comment.