close pool if exists

src/handlers/create_connection.rs

@@ -4,7 +4,9 @@ use sqlx::mysql::MySqlPool;
 
 pub async fn handler(_key: Key, app: &mut App) -> anyhow::Result<()> {
     if let Some(conn) = app.selected_connection() {
-        app.pool.as_ref().unwrap().close().await;
+        if let Some(pool) = app.pool.as_ref() {
+            pool.close().await;
+        }
         let pool = MySqlPool::connect(conn.database_url().as_str()).await?;
         app.pool = Some(pool);
         app.focus_type = FocusType::Dabatases(true);