add default values

app.py

@@ -47,7 +47,7 @@ def reshape_input(vec):
 
 
 # inference fn
-def predict(mseeds, waveforms, stations):
+def predict(mseeds=[], waveforms="", stations=""):
     if len(stations) > 0:
         stations = json.loads(stations)
         print(f"{len(stations)}: {stations = }")