fix group serializer

(cherry picked from commit e47d84f1af1eebe63b3dfc618daee29e18ee4156)

# Conflicts:
#	app/src/main/java/eu/kanade/tachiyomi/source/online/handlers/ApiMangaParser.kt
#	app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaDetailsController.kt
#	app/src/main/res/raw/changelog_release.xml
#	buildSrc/src/main/kotlin/Configs.kt

app/src/main/java/exh/md/handlers/ApiMangaParser.kt

@@ -230,7 +230,13 @@ class ApiMangaParser(private val langs: List<String>) {
         val networkApiManga = MdUtil.jsonParser.decodeFromString<ApiMangaSerializer>(jsonData)
         val networkManga = networkApiManga.data.manga
         val networkChapters = networkApiManga.data.chapters
-        val groups = networkApiManga.data.groups.map { it.id to it.name }.toMap()
+        val groups = networkApiManga.data.groups.mapNotNull {
+            if (it.name == null) {
+                null
+            } else {
+                it.id to it.name
+            }
+        }.toMap()
 
         val status = networkManga.publication!!.status
 

app/src/main/java/exh/md/handlers/serializers/ApiMangaSerializer.kt

@@ -72,5 +72,5 @@ data class ChapterSerializer(
 @Serializable
 data class GroupSerializer(
     val id: Long,
-    val name: String
+    val name: String? = null
 )