Skip parsing excluded books when preprocessing

[ddaspit]

• fixes Don't crash everything if USFM books are not included in training serval#400

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This change is 

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.92929% with 113 lines in your changes missing coverage. Please review.

Project coverage is 67.23%. Comparing base (3182ff2) to head (02c3efb).
Report is 30 commits behind head on master.

Files	Patch %	Lines
src/SIL.Machine/Corpora/CorporaExtensions.cs	23.18%	51 Missing and 2 partials ⚠️
src/SIL.Machine/Corpora/DictionaryTextCorpus.cs	34.78%	15 Missing ⚠️
src/SIL.Machine/Corpora/AlignmentCorpusBase.cs	0.00%	12 Missing ⚠️
src/SIL.Machine/Corpora/TextCorpusBase.cs	0.00%	12 Missing ⚠️
...c/SIL.Machine/Corpora/DictionaryAlignmentCorpus.cs	50.00%	7 Missing ⚠️
src/SIL.Machine/Corpora/ParallelTextCorpus.cs	73.91%	5 Missing and 1 partial ⚠️
...chine.AspNetCore/Services/NmtPreprocessBuildJob.cs	83.33%	4 Missing and 1 partial ⚠️
src/SIL.Machine/Corpora/ParallelTextCorpusBase.cs	80.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #207      +/-   ##
==========================================
- Coverage   67.35%   67.23%   -0.13%     
==========================================
  Files         441      441              
  Lines       35144    35277     +133     
  Branches     4703     4721      +18     
==========================================
+ Hits        23672    23717      +45     
- Misses      10381    10466      +85     
- Partials     1091     1094       +3     

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[johnml1135]

src/SIL.Machine.AspNetCore/Services/NmtPreprocessBuildJob.cs line 236 at r1 (raw file):

    private static bool IsInTrain(Row row, Corpus corpus)
    {
        if (corpus.TrainOnChapters is not null)

TrainOnChapters is never null (a bug I found). Either we check for null or length == 0, or we change how it is made up at the Serval level to send a true null down.

[johnml1135]

src/SIL.Machine.AspNetCore/Services/NmtPreprocessBuildJob.cs line 269 at r1 (raw file):

        if (!corpus.TrainOnAll)
        {
            IEnumerable<string> textIds = corpus.TrainOnChapters is not null

is null or empty.

[johnml1135]

src/SIL.Machine.AspNetCore/Services/NmtPreprocessBuildJob.cs line 393 at r1 (raw file):

        if (!corpus.PretranslateAll)
        {
            IEnumerable<string> textIds = corpus.PretranslateChapters is not null

null or empty.

[johnml1135]

Reviewed 13 of 13 files at r1, all commit messages.
Reviewable status: all files reviewed, 3 unresolved discussions (waiting on @ddaspit)

[johnml1135]

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: all files reviewed, 3 unresolved discussions (waiting on @ddaspit)

[johnml1135]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ddaspit)