Ensure memo is correctly passed around when transforming classes

source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/model/SChapter.kt

@@ -36,6 +36,7 @@ interface SChapter : Serializable {
         date_upload = other.date_upload
         chapter_number = other.chapter_number
         scanlator = other.scanlator
+        memo = other.memo
     }
 
     companion object {

source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/model/SChapterImpl.kt

@@ -3,6 +3,7 @@
 package eu.kanade.tachiyomi.source.model
 
 import kotlinx.serialization.json.JsonObject
+import mihon.core.common.extensions.EMPTY
 
 class SChapterImpl : SChapter {
 
@@ -16,5 +17,5 @@ class SChapterImpl : SChapter {
 
     override var date_upload: Long = 0
 
-    override var memo: JsonObject = JsonObject(emptyMap())
+    override var memo: JsonObject = JsonObject.EMPTY
 }

source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/model/SManga.kt

@@ -56,6 +56,7 @@ interface SManga : Serializable {
         it.thumbnail_url = thumbnail_url
         it.update_strategy = update_strategy
         it.initialized = initialized
+        it.memo = memo
     }
 
     companion object {

source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/model/SMangaImpl.kt

@@ -3,6 +3,7 @@
 package eu.kanade.tachiyomi.source.model
 
 import kotlinx.serialization.json.JsonObject
+import mihon.core.common.extensions.EMPTY
 
 class SMangaImpl : SManga {
 
@@ -26,5 +27,5 @@ class SMangaImpl : SManga {
 
     override var initialized: Boolean = false
 
-    override var memo: JsonObject = JsonObject(emptyMap())
+    override var memo: JsonObject = JsonObject.EMPTY
 }