fix(route/kurogames): handle unavailable article content property (#19131)

The article https://wutheringwaves.kurogames.com/zh-tw/main/news/detail/2596 has no article content
property in the API and causes a cheerio load error during runtime, this commit fixes that issue and
falls back to an empty RSS item description for these kind of articles.

Closes #19124

lib/routes/kurogames/wutheringwaves/constants.ts

@@ -21,7 +21,7 @@ export enum Parameter {
 export const SUPPORTED_LANGUAGES = Object.values(Language);
 
 export interface Article {
-    articleContent: string;
+    articleContent?: string;
     articleDesc: string;
     articleId: number;
     articleTitle: string;

lib/routes/kurogames/wutheringwaves/news.ts

@@ -63,7 +63,10 @@ Language codes for the \`${Parameter.Language}\` parameter:
                 };
 
                 return cache.tryGet(`wutheringwaves:${language}:${article.articleId}`, async () => {
-                    const { articleContent } = await ofetch<Article>(contentUrl, { query: { t: Date.now() } });
+                    const articleDetails = await ofetch<Article>(contentUrl, { query: { t: Date.now() } });
+                    // Article content may not always be available, e.g: https://wutheringwaves.kurogames.com/zh-tw/main/news/detail/2596
+                    const articleContent = articleDetails.articleContent ?? '';
+
                     const $ = cheerio.load(articleContent);
 
                     item.description = $.html() ?? article.articleDesc ?? '';