Fix intermittent empty options expiry dropdown after coin select.

Retry instrument fetch, reject empty chains instead of caching them, and ignore stale loadChain races.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/options/options_register.py

@@ -353,13 +353,27 @@ def register_options_routes(app: Flask, cfg: dict[str, Any]) -> None:
         if ex is None:
             return jsonify({"ok": False, "msg": err})
         u = (request.args.get("underlying") or cfg["default_underly"]).upper()
-        chain = cfg["build_option_chain"](
-            ex,
-            u,
-            max_dte_days=cfg["chain_max_dte_days"],
-            itm_only=False,
-            itm_max_dist_usd=cfg["itm_max_dist"],
-        )
+        try:
+            chain = cfg["build_option_chain"](
+                ex,
+                u,
+                max_dte_days=cfg["chain_max_dte_days"],
+                itm_only=False,
+                itm_max_dist_usd=cfg["itm_max_dist"],
+            )
+        except Exception as e:
+            return jsonify({"ok": False, "msg": f"加载期权链失败: {e}"})
+        expiries = chain.get("expiries") or []
+        chain_err = chain.get("chain_error")
+        if not expiries:
+            return jsonify(
+                {
+                    "ok": False,
+                    "msg": chain_err or "暂无到期日,请稍后点「刷新链」",
+                    **chain,
+                    "chain_max_dte_days": cfg["chain_max_dte_days"],
+                }
+            )
         return jsonify({"ok": True, **chain, "chain_max_dte_days": cfg["chain_max_dte_days"]})
 
     @app.route("/api/options/quote")

lib/options/templates/options_panel.html

@@ -273,4 +273,4 @@
     </div>
 </div>
 <script src="/static/options_expiry_countdown.js?v=1"></script>
-<script src="/static/options_panel.js?v=34"></script>
+<script src="/static/options_panel.js?v=35"></script>