fix(deltachat-jsonrpc): do not fail get_chatlist_items_by_entries if the message got deleted

The message may be deleted while chatlist item is loading.
In this case displaying "No messages" is better than failing.
Ideally loading of the chatlist item
should happen in 1 database transaction and
always return some message if chat is not empty,
but this requires large refactoring.

deltachat-jsonrpc/src/api/types/chat_list.rs

@@ -88,11 +88,17 @@ pub(crate) async fn get_chat_list_item_by_id(
 
     let (last_updated, message_type) = match last_msgid {
         Some(id) => {
-            let last_message = deltachat::message::Message::load_from_db(ctx, id).await?;
-            (
-                Some(last_message.get_timestamp() * 1000),
-                Some(last_message.get_viewtype().into()),
-            )
+            if let Some(last_message) =
+                deltachat::message::Message::load_from_db_optional(ctx, id).await?
+            {
+                (
+                    Some(last_message.get_timestamp() * 1000),
+                    Some(last_message.get_viewtype().into()),
+                )
+            } else {
+                // Message may be deleted by the time we try to load it.
+                (None, None)
+            }
         }
         None => (None, None),
     };