Fix for anon_chi missing

[Moohan]

slfhelper::get_anon_chi converts NA to "TkE=" which would then be converted back to "e1" 🤯

This fixes that by making NA CHIs blank "", then making blank anon_chis NA after.

slfhelper should be updated so that it always converts NA to NA.

[github-actions]

@check-spelling-bot Report

🔴 Please review

See the 📂 files view or the 📜action log for details.

Unrecognized words (2)

hhg
sparra

To accept ✔️ these unrecognized words as correct and remove the previously acknowledged and now absent words, run the following commands

... in a clone of the [email protected]:Public-Health-Scotland/source-linkage-files.git repository
on the anon_chi_na branch (ℹ️ how do I use this?):

curl -s -S -L 'https://raw.githubusercontent.com/check-spelling/check-spelling/main/apply.pl' |
perl - 'https://github.com/Public-Health-Scotland/source-linkage-files/actions/runs/5597598077/attempts/1'

To have the bot do this for you, reply quoting the following line:
@check-spelling-bot apply updates.

If the flagged items are 🤯 false positives

If items relate to a ...

• binary file (or some other file you wouldn't want to check at all).

  Please add a file path to the excludes.txt file matching the containing file.

  File paths are Perl 5 Regular Expressions - you can test yours before committing to verify it will match your files.

  ^ refers to the file's path from the root of the repository, so ^README\.md$ would exclude README.md (on whichever branch you're using).

• well-formed pattern.

  If you can write a pattern that would match it,
  try adding it to the patterns.txt file.

  Patterns are Perl 5 Regular Expressions - you can test yours before committing to verify it will match your lines.

  Note that patterns can't match multiline strings.

[Jennit07]

Looks good. Ready to merge