fix logging in case axon is not set

prompting/base/validator.py

@@ -127,10 +127,15 @@ def run(self):
 
         # Check that validator is registered on the network.
         self.sync()
-
-        bt.logging.info(
-            f"Running validator {self.axon} on network: {self.config.subtensor.chain_endpoint} with netuid: {self.config.netuid}"
-        )
+
+        if not self.config.neuron.axon_off:
+            bt.logging.info(
+                f"Running validator {self.axon} on network: {self.config.subtensor.chain_endpoint} with netuid: {self.config.netuid}"
+            )
+        else:
+            bt.logging.info(
+                f"Running validator on network: {self.config.subtensor.chain_endpoint} with netuid: {self.config.netuid}"
+            )
 
         bt.logging.info(f"Validator starting at block: {self.block}")