SF-3750 Improve import from spreadsheet error messages

[pmachapman]

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.34%. Comparing base (30abe0f) to head (2285a4d).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ClientApp/src/xforge-common/csv-service.service.ts	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3769   +/-   ##
=======================================
  Coverage   81.33%   81.34%           
=======================================
  Files         622      622           
  Lines       39193    39202    +9     
  Branches     6399     6401    +2     
=======================================
+ Hits        31879    31889   +10     
+ Misses       6327     6326    -1     
  Partials      987      987           

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[RaymondLuong3]

@RaymondLuong3 reviewed 5 files and all commit messages, and made 1 comment.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on pmachapman).

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src/SIL.XForge.Scripture/ClientApp/src/app/checking/import-questions-dialog/import-questions-dialog.component.ts line 695 at r2 (raw file):

      if (convertedData == null) {
        this.questionSource = 'csv_file';
        this.errorState = 'invalid_spreadsheet';

Nice. I can get into this state if I upload an empty .xls file. This is a nice catch-all for files that are in a state that we did not expect and parsing fails.

Code quote:

        this.errorState = 'invalid_spreadsheet';