fix: handle empty other race options

[ColinBuyck]

This PR addresses metrotranscom#1009

• Addresses the issue in full
• Addresses only certain aspects of the issue
  The ticket also mentions cleaning up the instances where doorway entered a space to get the "other" field to save which this PR doesn't cover.

Description

This PR includes two different empty string checks in the formKeys file which prevents the selection of other without entering further information from being filtered out or being stored with a colon and space.

How Can This Be Tested/Reviewed?

This can be tested by
a) submitting an online app with a mix of demographic data (including other selections without any text inputted) and going to the partners portal to see that it was stored correctly
b) submit a paper app to the same listing with a unique mix of demographic data also including empty other selections and then edit this paper app multiple times to ensure that the selections are saved
c) export the applications to that listing to see that they print in a legible way.

Author Checklist:

• Added QA notes to the issue with applicable URLs
• Reviewed in a desktop view
• Reviewed in a mobile view
• Reviewed considering accessibility
• Added tests covering the changes
• Made corresponding changes to the documentation
• Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

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[ludtkemorgan]

This looks good and solves the issue.

I did notice that if you use a : within the free text everything after the colon disappears. for example human:alien is saved as human. Looks like that issue also exists in main.