Update minio/minioadmin.py

Author: balamurugana

minio/minioadmin.py

@@ -459,7 +459,7 @@ def policy_add(self,
         """Add new policy."""
         if not (policy_file is not None) ^ (policy is not None):
             raise ValueError("either policy_file or policy must be provided")
-        body = policy
+        body = json.dumps(policy).encode() if policy else None
         if policy_file:
             with open(policy_file, encoding='utf-8') as file:
                 body = file.read().encode()