Merge pull request #28 from alipay/dev_chongshi

fix: prompt model bool function.

agentuniverse/prompt/prompt_model.py

@@ -33,4 +33,4 @@ def __bool__(self):
         Return True if one of the introduction, target and instruction attribute is not empty.
         Return False otherwise.
         """
-        return bool(self.introduction or self.introduction or self.introduction)
+        return bool(self.introduction or self.target or self.instruction)