Update app.py

app.py

@@ -153,8 +153,9 @@ QWEN_MODEL_ID = os.getenv("QWEN_MODEL_ID", "Qwen/Qwen2.5-3B-Instruct")
 WHISPER_SIZE = os.getenv("WHISPER_SIZE", "small")
 XTTS_MODEL_ID = os.getenv("XTTS_MODEL_ID", "tts_models/multilingual/multi-dataset/xtts_v2")
 
+
 SYSTEM_PROMPT = os.getenv(
-    "SYSTEM_PROMPT"
+    "SYSTEM_PROMPT",
     "انت مساعد مصري. رد باللهجة المصرية فقط وبالعربي فقط. ممنوع تستخدم اي كلام انجليزي. ردودك قصيرة وواضحة."
 )
 
@@ -205,11 +206,19 @@ def transcribe_file(path: str) -> str:
 # history format: list of [user, assistant]
 # ----------------------------
 def qwen_reply(history, user_text: str) -> str:
-    messages = [{"role": "system", "content": SYSTEM_PROMPT}]
+    messages = [{"role": "system", "content": SYSTEM_PROMPT or ""}]
 
     for u, a in (history or [])[-MAX_TURNS:]:
-        messages.append({"role": "user", "content": u})
-        messages.append({"role": "assistant", "content": a})
+        u = "" if u is None else str(u)
+        a = "" if a is None else str(a)
+        if u.strip():
+            messages.append({"role": "user", "content": u})
+        if a.strip():
+            messages.append({"role": "assistant", "content": a})
+
+    user_text = "" if user_text is None else str(user_text)
+    if not user_text.strip():
+        return "ممكن تكتب سؤالك تاني؟"
 
     messages.append({"role": "user", "content": user_text})