[2.4] fix the str function of the extra list (#2098)

/kind improvement
issue: milvus-io/milvus#30436
link pr: #2092

Signed-off-by: SimFG <bang.fu@zilliz.com>

pymilvus/client/types.py

@@ -933,7 +933,7 @@ def __init__(self, *args, extra: Optional[Dict] = None, **kwargs) -> None:
 
     def __str__(self) -> str:
         """Only print at most 10 query results"""
-        return f"data: {list(map(str, self[:10]))} {'...' if len(self) else ''}, extra_info: {self.extra}"
+        return f"data: {list(map(str, self[:10]))} {'...' if len(self) > 10 else ''}, extra_info: {self.extra}"
 
     __repr__ = __str__