update existing qas.json

app.py

@@ -59,7 +59,7 @@ def read_qs(qs, qas):
                 qs.append(query)
     print(f"read {len(qs)} queries from files")
     
-    if os.path.exists("qas.json"):
+    if os.path.exists(f"{directory}/qas.json"):
         with open(f"{directory}/qas.json", "r", encoding="utf-8") as f:
             qas = json.loads(f.read())
         print(f"read {len(qas)} query-responses from qas.json")