Fix crash parsing an empty multi-text that contains an empty span (#1… · sillsdev/libpalaso@d85edaa

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-dotnet@3447fd6a9f9e57506b15f895c5b76d3b197dc7c2, microsoft/setup-msbuild@1ff57057b5cfdc39105cd07a01d78e9b0ea0c14c. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Update l10n strings: SIL.Core/ObjectModel/ObservableISet.cs#L23

Identifier '_set' is not CLS-compliant

Update l10n strings: SIL.Core/Reporting/FontAnalytics.cs#L128

The variable 'err' is declared but never used

Update l10n strings: SIL.Core/Reporting/FontAnalytics.cs#L156

The variable 'err' is declared but never used

Update l10n strings: SIL.WritingSystems/IcuUCharCategoryExtensions.cs#L8

Argument type 'Character.UCharCategory' is not CLS-compliant

Update l10n strings: SIL.Windows.Forms/Extensions/ToolStripExtensions.cs#L96

Argument type 'ILocalizationManager' is not CLS-compliant

Update l10n strings: SIL.Windows.Forms/LocalizationIncompleteDlg/LocalizationIncompleteViewModel.cs#L13

Type of 'LocalizationIncompleteViewModel.PrimaryLocalizationManager' is not CLS-compliant