Python: SK 0.5.0 breaks streaming

**Describe the bug**
Calling `invoke_stream` raises the following exception in the context:

```text
Error occurred while invoking stream function: 'PromptTemplate' object has no attribute 'render_messages'
```

It seems like a `else` is missing in `_local_stream_func` (which was there before #4491)

 https://github.com/microsoft/semantic-kernel/blob/dcd7e1424f183318b2c5b12cb4010d65740ea0b4/python/semantic_kernel/orchestration/kernel_function.py#L253-L267

**To Reproduce**

1. Execute `invoke_stream` on any function of your choice
2. Check `context.last_exception` for the message

**Expected behavior**
No exception should be raised

**Platform**
 - OS: WSL
 - IDE: VS Code
 - Language: Python
 - Source: 0.5.0


	async def _local_stream_func(client, prompt_execution_settings, context):
	if client is None:
	raise ValueError("AI LLM service cannot be `None`")

	if not function_config.has_chat_prompt:
	try:
	prompt = await function_config.prompt_template.render(context)
	result = client.complete_stream(prompt, prompt_execution_settings)
	async for chunk in result:
	yield chunk
	except Exception as e:
	# TODO: "critical exceptions"
	context.fail(str(e), e)

	try:

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Python: SK 0.5.0 breaks streaming #4925

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Python: SK 0.5.0 breaks streaming #4925

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