Incorrect Appx filtering results when the -e parameter is specified but not -l

[BlueRain-debug]

There is a logic error in src/CompDB/Applications/AppxSelectionEngine.cs#L499 public static PackageProperties[] GetAppxFilesToKeep(CompDB editionCdb, IEnumerable appsCdbs, string editionLanguage).

The issue manifests when the caller (DownloadHelpers.cs) passes an empty Language string. This happens when the user specifies a sku but leaves the language empty.

Caller: src/UnifiedUpdatePlatform.Services.WindowsUpdate.Downloads/DownloadHelpers.cs#L334

When the condition is (false, true) (Language is empty), the code calls AppxSelectionEngine.GetAppxFilesToKeep(cdb, AppCompDBs, Language) with an empty Language string.

Since editionLanguage is empty, GetAppxFilesToKeep fails to match any valid language resource packages.

Expected Behavior
Inside GetAppxFilesToKeep, if editionLanguage is empty (or null), it should skip the language filtering.