Pass no tool argument when none provided

OpenAI's API requires that the tool list has at least one element
when it is present.

Also, pass the tools even when not streaming

chatlab/chat.py

@@ -261,6 +261,7 @@ async def submit(self, *messages: Union[ChatCompletionMessageParam, str], stream
             stream: Whether to stream chat into markdown or not. If False, the entire chat will be sent once.
 
         """
+
         full_messages: List[ChatCompletionMessageParam] = []
         full_messages.extend(self.messages)
 
@@ -285,14 +286,14 @@ async def submit(self, *messages: Union[ChatCompletionMessageParam, str], stream
                 "temperature": kwargs.get("temperature", 0),
             }
 
+            if self.legacy_function_calling:
+                chat_create_kwargs.update(self.function_registry.api_manifest())
+            else:
+                chat_create_kwargs["tools"] = self.function_registry.tools or None
+
             # Due to the strict response typing based on `Literal` typing on `stream`, we have to process these
             # two cases separately
             if stream:
-                if self.legacy_function_calling:
-                    chat_create_kwargs.update(self.function_registry.api_manifest())
-                else:
-                    chat_create_kwargs["tools"] = self.function_registry.tools
-
                 streaming_response = await client.chat.completions.create(
                     **chat_create_kwargs,
                     stream=True,