chore(controller): avoid error when secret no data field (#117)

Author: jianxiaoguo

rootfs/scheduler/resources/secret.py

@@ -30,7 +30,7 @@ def get(self, namespace, name=None, **kwargs):
 
         # decode the base64 data
         secrets = response.json()
-        for key, value in secrets['data'].items():
+        for key, value in secrets.get('data', {}).items():
             if value is None:
                 secrets['data'][key] = ''
                 continue