fix: ensure the api_base isn't empty before checking it

Signed-off-by: Frost Ming <[email protected]>

xiaogpt/config.py

@@ -92,7 +92,8 @@ def __post_init__(self) -> None:
  elif not self.openai_key:
  raise Exception("Using GPT api needs openai API key, please google how to")
  if (
- self.api_base.endswith(("openai.azure.com", "openai.azure.com/"))
+ self.api_base
+ and self.api_base.endswith(("openai.azure.com", "openai.azure.com/"))
  and not self.deployment_id
  ):
  raise Exception(