update readme.md

app.py

@@ -103,9 +103,9 @@ if st.session_state['tokenizer_json'] is not None:
 
         with prompt_template_col:
             list_of_templates = get_existing_templates()
-            selected_template = st.selectbox("Choose Existing Template or Leave Blank.", 
+            selected_template = st.selectbox("Choose Existing Template or Leave Blank. (If template is None, it will check current tokenizer's `chat_template` and `default_chat_template` fields)", 
                 options=list_of_templates, 
-                index=0, placeholder="Choose an option", disabled=False, label_visibility="visible")
+                index=0, placeholder="Choose a template (If template is None, it will check current tokenizer `chat_template` and `default_chat_template` fields)", disabled=False, label_visibility="visible")
             # add_generation_prompt_checkbox = st.checkbox("add_generation_prompt")
             generate_prompt_example_button = st.button("Generate Prompt", key="generate_prompt_example_button")
 
@@ -119,6 +119,12 @@ if st.session_state['tokenizer_json'] is not None:
                     jinja_lines = f.readlines()
                     st.session_state['input_jinja_template'] = "".join(jinja_lines)
 
+            if selected_template is None:
+                st.session_state['input_jinja_template'] = st.session_state['tokenizer'].chat_template 
+                if st.session_state['input_jinja_template'] is None:
+                    st.session_state['input_jinja_template'] = st.session_state['tokenizer'].default_chat_template
+
+
             st.session_state['input_jinja_template'] = st.text_area(
                 "Jinja Chat Template", value=st.session_state['input_jinja_template'], 
                 height=500, placeholder=None, disabled=False, label_visibility="visible")