feat(Session): Add fallback for session data retrieval (#490)

* feat(Session): Add fallback for session data retrieval

Should have added this when we first implemented session data retrieval to be honest. It makes a request to YouTube's service worker and the data there can change or the request can just fail.

* chore: lint

src/core/Session.ts

@@ -217,10 +217,17 @@ export default class Session extends EventEmitterLike {
   ) {
     let session_data: SessionData;
 
+    const session_args = { lang, location, time_zone: tz, device_category, client_name, enable_safety_mode, visitor_data };
+
     if (generate_session_locally) {
-      session_data = this.#generateSessionData({ lang, location, time_zone: tz, device_category, client_name, enable_safety_mode, visitor_data });
+      session_data = this.#generateSessionData(session_args);
     } else {
-      session_data = await this.#retrieveSessionData({ lang, location, time_zone: tz, device_category, client_name, enable_safety_mode, visitor_data }, fetch);
+      try {
+        // This can fail if the data changes or the request is blocked for some reason.
+        session_data = await this.#retrieveSessionData(session_args, fetch);
+      } catch (err) {
+        session_data = this.#generateSessionData(session_args);
+      }
     }
 
     return { ...session_data, account_index };