Allow usage without chat template

app.py

@@ -73,7 +73,9 @@ else:
 if chat_template is None:
     chat_template = text_tokenizer.chat_template
 if chat_template is None:
-    raise ValueError("Chat template not found in the tokenizer. Please select a chat template from the dropdown.")
+    # raise ValueError("Chat template not found in the tokenizer. Please select a chat template from the dropdown.")
+    import warnings
+    st.warning("Chat template not found in the tokenizer. Not using any chat template.")
 
 with st.expander("Click to see the chat template"):
     st.markdown("#### Chat Template (in Jinja2 format)")
@@ -89,7 +91,10 @@ try:
 except:
     pass
 
-converted_message = text_tokenizer.apply_chat_template(message, tokenize=False, add_generation_prompt=False, chat_template=chat_template)
+if chat_template is not None:
+    converted_message = text_tokenizer.apply_chat_template(message, tokenize=False, add_generation_prompt=False, chat_template=chat_template)
+else:
+    converted_message = message
 
 st.markdown("#### Original Message")
 st.code(converted_message, language="html")