Fix error on initialization with no symbols

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

src/threads/data/mod.rs

@@ -142,6 +142,11 @@ async fn handle_message(
     news_backfill_sender: mpsc::Sender<backfill::Message>,
     message: Message,
 ) {
+    if message.assets.is_empty() {
+        message.response.send(()).unwrap();
+        return;
+    }
+
     let (us_equity_symbols, crypto_symbols): (Vec<_>, Vec<_>) = message
         .assets
         .clone()
@@ -233,8 +238,8 @@ async fn handle_message(
 
                     let position_future = async {
                         alpaca::api::incoming::position::get_by_symbol(
-                            &config.alpaca_rate_limiter,
                             &config.alpaca_client,
+                            &config.alpaca_rate_limiter,
                             &symbol,
                             Some(backoff::infinite()),
                         )