Empty argument gets encoded as [] instead of {}

Signed-off-by: Lukas Schaefer <lukas@lschaefer.xyz>

Author: lukasdotcom

lib/Service/OpenAiAPIService.php

@@ -487,6 +487,9 @@ public function createChatCompletion(
 							'function' => $toolCall,
 						];
 						$formattedToolCall['function']['arguments'] = json_encode($toolCall['args']);
+						if ($formattedToolCall === '[]') {
+							$formattedToolCall = '{}';
+						}
 						unset($formattedToolCall['function']['id']);
 						unset($formattedToolCall['function']['args']);
 						unset($formattedToolCall['function']['type']);