[Mangadex] Handle empty title case, where title is romaji-only (ja) or otherwise missing, by picking whatever value is in title field as a last resort (#9598)

src/all/mangadex/build.gradle

@@ -6,7 +6,7 @@ ext {
     extName = 'MangaDex'
     pkgNameSuffix = 'all.mangadex'
     extClass = '.MangaDexFactory'
-    extVersionCode = 139
+    extVersionCode = 140
     isNsfw = true
 }
 

src/all/mangadex/src/eu/kanade/tachiyomi/extension/all/mangadex/MangaDexHelper.kt

@@ -183,6 +183,8 @@ class MangaDexHelper() {
                         val altTitle = it.asMdMap()
                         altTitle[lang] ?: altTitle["en"] != null
                     }?.asMdMap()?.values?.singleOrNull()
+                ?: titleMap["ja"]   // romaji titles are sometimes ja (and are not altTitles)
+                ?: titleMap.values.firstOrNull()    // use literally anything from title as a last resort
             title = cleanString(dirtyTitle ?: "")
 
             coverFileName?.let {