Fix IRawGalleryExtension.shortDescription can be undefined. (microsoft#202780)

`IRawGalleryExtension.shortDescription` can be undefined, some extensions doesn't have a "shortDescription" like: "temakulakov.hackjb"

Author: petvas

src/vs/platform/extensionManagement/common/extensionGalleryService.ts

@@ -68,7 +68,7 @@ interface IRawGalleryExtension {
 	readonly extensionId: string;
 	readonly extensionName: string;
 	readonly displayName: string;
-	readonly shortDescription: string;
+	readonly shortDescription?: string;
 	readonly publisher: IRawGalleryExtensionPublisher;
 	readonly versions: IRawGalleryExtensionVersion[];
 	readonly statistics: IRawGalleryExtensionStatistics[];
@@ -532,7 +532,7 @@ function toExtension(galleryExtension: IRawGalleryExtension, version: IRawGaller
 		publisherDisplayName: galleryExtension.publisher.displayName,
 		publisherDomain: galleryExtension.publisher.domain ? { link: galleryExtension.publisher.domain, verified: !!galleryExtension.publisher.isDomainVerified } : undefined,
 		publisherSponsorLink: getSponsorLink(latestVersion),
-		description: galleryExtension.shortDescription || '',
+		description: galleryExtension.shortDescription ?? '',
 		installCount: getStatistic(galleryExtension.statistics, 'install'),
 		rating: getStatistic(galleryExtension.statistics, 'averagerating'),
 		ratingCount: getStatistic(galleryExtension.statistics, 'ratingcount'),