update

app.py

@@ -94,6 +94,10 @@ def run_gamma(picks, config, stations):
         + config["dims"]
         + ["magnitude", "sigma_time", "sigma_amp", "cov_time_amp", "event_index", "gamma_score"],
     )
+    if len(catalogs) == 0:
+        print("No events associated")
+        return pd.DataFrame(), pd.DataFrame()
+
     catalogs[["longitude", "latitude"]] = catalogs.apply(
         lambda x: pd.Series(proj(longitude=x["x(km)"], latitude=x["y(km)"], inverse=True)), axis=1
     )