Arguments for tool calls are encoded incorrectly

[lukasdotcom]

Which version of integration_openai are you using?

3.7.1

Which version of Nextcloud are you using?

32

Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please.

No response

Describe the Bug

When the encoding of the arguments happens it can cause a problem when the argument is an empty object {} it can be reencoded as []

integration_openai/lib/Service/OpenAiAPIService.php

Lines 476 to 494 in 63da2f6

	if ($history !== null) {
	foreach ($history as $i => $historyEntry) {
	$message = json_decode($historyEntry, true);
	if ($message['role'] === 'human') {
	$message['role'] = 'user';
	}
	if (isset($message['tool_calls']) && is_array($message['tool_calls'])) {
	$message['tool_calls'] = array_map(static function ($toolCall) {
	$formattedToolCall = [
	'id' => $toolCall['id'],
	'type' => 'function',
	'function' => $toolCall,
	];
	$formattedToolCall['function']['arguments'] = json_encode($toolCall['args']);
	unset($formattedToolCall['function']['id']);
	unset($formattedToolCall['function']['args']);
	unset($formattedToolCall['function']['type']);
	return $formattedToolCall;
	}, $message['tool_calls']);

I did make a draft pr, but it has unintended side effects at: #243

Expected Behavior

^

To Reproduce

Get tool call that has no arguments. Ex: list current user information