add error for no context and fix f-string error

app.py

@@ -7,6 +7,7 @@ siteUrl = "https://aloqas-aloqas-qa-fastapi.hf.space"
 
 userContext = None
 context = None
+error = 0
 
 with st.sidebar:
     st.title("Configuration")
@@ -34,7 +35,8 @@ if "messages" not in st.session_state:
 if prompt := st.chat_input(placeholder="Write to ALOQAS..."):
     st.session_state.messages.append({"role": "user", "content": prompt})
     params = {'texte': prompt, "model": model}
-    if userContext is not None:
+    print(repr(userContext))
+    if userContext is not '':
         if contextSelect == "File" and userContext:
             # Préparation de la liste des fichiers pour l'envoi
             files = [("file", (file.name, file, file.type)) for file in userContext]
@@ -47,16 +49,22 @@ if prompt := st.chat_input(placeholder="Write to ALOQAS..."):
             st.session_state.messages.append({"role": "assistant", "content": json.loads(response.text)["answer"]})
 
     else:
-        response = requests.post(siteUrl + '/withoutFile/', params=params)
+        error = 1
 
     # st.write("Statut de la requête:", response.status_code)
     # st.write("Réponse du serveur:", response.text)
 
-    with st.sidebar:
-        st.title("Statistics on the last answer")
-        st.write(f"Score: {round(json.loads(response.text)["score"], 3)}")
-        st.write(f"Start: {json.loads(response.text)["start"]}")
-        st.write(f"End: {json.loads(response.text)["end"]}")
+    if userContext is not '':
+        with st.sidebar:
+            st.title("Statistics on the last answer")
+            st.write(f"Score: {round(json.loads(response.text)['score'], 3)}")
+            st.write(f"Start: {json.loads(response.text)["start"]}")
+            st.write(f"End: {json.loads(response.text)["end"]}")
 
 for msg in st.session_state.messages:
     st.chat_message(msg["role"]).write(msg["content"])
+
+if error == 1:
+        message_rouge = "⚠️ Please provide a context via the menu on your left."
+        st.markdown(f'<div style="color: white; background-color: #ff4444; padding: 10px; border-radius: 5px;">{message_rouge}</div>', unsafe_allow_html=True)
+        error = 0