tiny fix

Former-commit-id: bb57478366a70a0871af30ab31c890f471e27ff4

src/llamafactory/data/formatter.py

@@ -216,7 +216,7 @@ class ToolFormatter(Formatter):
             self._tool_formatter = glm4_tool_formatter
             self._tool_extractor = glm4_tool_extractor
         else:
-            raise ValueError("Tool format was not found.")
+            raise NotImplementedError("Tool format {} was not found.".format(self.tool_format))
 
     def apply(self, **kwargs) -> SLOTS:
         content = kwargs.pop("content")

src/llamafactory/data/template.py

@@ -387,8 +387,9 @@ def get_template_and_fix_tokenizer(
         template = TEMPLATES.get(name, None)
         if template is None:
             raise ValueError("Template {} does not exist.".format(name))
-        
-    if tool_format:
+
+    if tool_format is not None:
+        logger.info("Using tool format: {}.".format(tool_format))
         template.format_tools = ToolFormatter(tool_format=tool_format)
 
     stop_words = template.stop_words
@@ -625,7 +626,6 @@ _register_template(
 
 _register_template(
     name="empty",
-    format_prefix=EmptyFormatter(slots=[{"bos_token"}]),
     efficient_eos=True,
 )