Minor change to get proper output quoting in writeJannoFileWithoutEmptyCols

[nevrome]

I noticed an issue in the output quoting of writeJannoFileWithoutEmptyCols. It caused the output of trident rectify --jannoRemoveEmpty to be unreadable to trident! The minimal change in this PR does seem to solve the problem.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 52.03%. Comparing base (7ba3f31) to head (82bc0e8).

Files with missing lines	Patch %	Lines
src/Poseidon/Core/Janno.hs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #393   +/-   ##
=======================================
  Coverage   52.03%   52.03%           
=======================================
  Files          37       37           
  Lines        5994     5994           
  Branches      644      644           
=======================================
  Hits         3119     3119           
  Misses       2231     2231           
  Partials      644      644           

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[stschiff]

OK, I think I understand the change, looks OK to me. I'm a bit surprised about the back and forth here... why do we first encode the Janno into byte string, then decode again, filter for non-empty columns using transpose and lists, and then encode back again. Isn't that one loop too many? Why can't we just do the filter immediately on the Janno Rows? Is that due to the columns perhaps not being aligned and uniform? Probably, right?

[nevrome]

In their normal state the janno rows have all sorts of types and it's complicated to determine if they are NA or not. After encoding every NA value is a string n/a. So the easiest way to check if an entire column is NA is to encode, then decode to Bytestring. It's really just a hack, but it works and does the thing in a few lines of code.