[Bugfix] Fix Hermes tool call chat template bug (#8256)

Co-authored-by: Kyle Mistele <kyle@constellate.ai>

examples/tool_chat_template_hermes.jinja

@@ -97,12 +97,13 @@
             {{- '{' }}
             {{- '"name": "' }}
             {{- tool_call.name }}
-                {{- '"}' }}
-                {{- ', ' }}
+            {{- '"' }}
             {%- if tool_call.arguments is defined %}
+                {{- ', ' }}
                 {{- '"arguments": ' }}
                 {{- tool_call.arguments|tojson }}
             {%- endif %}
+            {{- '}' }}
             {{- '\n</tool_call>' }}
         {%- endfor %}
         {{- '<|im_end|>\n' }}