Fix admin: can't read config and empty line error (#10574)

### What problem does this PR solve?

As title.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

admin/client/admin_client.py

@@ -100,6 +100,7 @@ NUMBER: /[0-9]+/
 %ignore WS
 """
 
+
 class AdminTransformer(Transformer):
 
     def start(self, items):
@@ -182,6 +183,7 @@ class AdminTransformer(Transformer):
     def meta_args(self, items):
         return items
 
+
 def encrypt(input_string):
     pub = '-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArq9XTUSeYr2+N1h3Afl/z8Dse/2yD0ZGrKwx+EEEcdsBLca9Ynmx3nIB5obmLlSfmskLpBo0UACBmB5rEjBp2Q2f3AG3Hjd4B+gNCG6BDaawuDlgANIhGnaTLrIqWrrcm4EMzJOnAOI1fgzJRsOOUEfaS318Eq9OVO3apEyCCt0lOQK6PuksduOjVxtltDav+guVAA068NrPYmRNabVKRNLJpL8w4D44sfth5RvZ3q9t+6RTArpEtc5sh5ChzvqPOzKGMXW83C95TxmXqpbK6olN4RevSfVjEAgCydH6HN6OhtOQEcnrU97r9H0iZOWwbw3pVrZiUkuRD1R56Wzs2wIDAQAB\n-----END PUBLIC KEY-----'
     pub_key = RSA.importKey(pub)
@@ -189,10 +191,12 @@ def encrypt(input_string):
     cipher_text = cipher.encrypt(base64.b64encode(input_string.encode('utf-8')))
     return base64.b64encode(cipher_text).decode("utf-8")
 
+
 def encode_to_base64(input_string):
     base64_encoded = base64.b64encode(input_string.encode('utf-8'))
     return base64_encoded.decode('utf-8')
 
+
 class AdminCLI(Cmd):
     def __init__(self):
         super().__init__()
@@ -209,8 +213,16 @@ class AdminCLI(Cmd):
 
     def onecmd(self, command: str) -> bool:
         try:
-            print(f"command: {command}")
+            # print(f"command: {command}")
             result = self.parse_command(command)
+
+            # if 'type' in result and result.get('type') == 'empty':
+            #     return False
+
+            if isinstance(result, dict):
+                if 'type' in result and result.get('type') == 'empty':
+                    return False
+
             self.execute_command(result)
 
             if isinstance(result, Tree):