Attempt to fix bugs related to empty vecs

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

src/threads/data/websocket/news.rs

@@ -3,6 +3,7 @@ use crate::config::{Config, CLICKHOUSE_BATCH_NEWS_SIZE};
 use async_trait::async_trait;
 use clickhouse::inserter::Inserter;
 use log::{debug, error, info};
+use nonempty::NonEmpty;
 use qrust::{
     types::{alpaca::websocket, News},
     utils::ONE_SECOND,
@@ -19,7 +20,7 @@ pub struct Handler {
 impl super::Handler for Handler {
     fn create_subscription_message(
         &self,
-        symbols: Vec<String>,
+        symbols: NonEmpty<String>,
     ) -> websocket::data::outgoing::subscribe::Message {
         websocket::data::outgoing::subscribe::Message::new_news(symbols)
     }