fixup! Close connection immediately during KeepAlive if it is not ass…

…ociated with a worker (#4678)

This is a just-in-case-logic is the connection is somehow detached from all Builders, but still leaving the connection active

master/buildbot/worker/manager.py

@@ -157,7 +157,9 @@ def newConnection(self, conn, workerName):
  self.connections[workerName] = conn
 
  def remove():
- assert self.connections.get(workerName, None) == conn, f"Attempt to remove non-connection entry for {workerName}"
+ assert (
+ self.connections.get(workerName, None) == conn
+ ), f"Attempt to remove non-connection entry for {workerName}"
  del self.connections[workerName]
 
  conn.notifyOnDisconnect(remove)