cowrie/wardenfiler: Fix spurious aggregated "Credentials" with values from the...

cowrie/wardenfiler: Fix spurious aggregated "Credentials" with values from the previous IP addresses

cowrie/wardenfiler.py

@@ -233,6 +233,8 @@ class Output(cowrie.core.output.Output):
                         event["Target"][0]["Anonymised"] = True
                     if a_creds:
                         event["Credentials"] = a_creds
+                    else:
+                        event.pop("Credentials", None)
                     self.save_event(event)
                 self.attackers = {}
                 self.attackers_creds = {}