fix bugfix bug

csst_dfs_client/common/request.py

@@ -24,7 +24,7 @@ def request_error_handler_decorator(func):
     def wrapper(*args, **kwargs):
         try:
             result = func(*args, **kwargs)
-            if result.headers['content-type'] == "application/octet-stream":
+            if 'content-type' in result.headers and result.headers['content-type'] == "application/octet-stream":
                 return result
             return Result.from_response(result)
         except requests.exceptions.ConnectionError as e: