Added `endif ` in `add_generation_prompt ` part

chat_template.jinja

@@ -82,4 +82,5 @@ For each function call, output the function name and arguments within the follow
 {%- endif -%}
 {%- endfor -%}
 {%- if add_generation_prompt -%}
-    <|assistant|>{{- '</think>' if (enable_thinking is defined and not enable_thinking) else '<think>' -}}
+    <|assistant|>{{- '</think>' if (enable_thinking is defined and not enable_thinking) else '<think>' -}}
+{%- endif -%}