Update app.py

app.py

@@ -123,16 +123,16 @@ if submit:
     st.session_state.submit = True
 
 if st.session_state.submit:
-    client = OpenAI(api_key=openai_api_key)
-    
-    try:    
-        client.Model.list()
-    except:
-        st.session_state.error = "OpenAI API key is invalid"
-        st.session_state.submit = False
-        st.rerun()
-        
     if uploaded_files:
+        client = OpenAI(api_key=openai_api_key)
+        
+        try:    
+            client.Model.list()
+        except:
+            st.session_state.error = "OpenAI API key is invalid"
+            st.session_state.submit = False
+            st.rerun()
+        
         textify_output = read_and_textify_advanced(uploaded_files, sentence_chunks)
         
         df = pd.DataFrame(textify_output)