Python: Checking if a “Dictionary” is empty doesn”t seem to work

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I am trying to check if a dictionary is empty but it doesn"t behave properly. It just skips it and displays ONLINE without anything except of display the message. Any ideas why ?

def isEmpty(self, dictionary):
    for element in dictionary:
        if element:
            return True
        return False

def onMessage(self, socket, message):
    if self.isEmpty(self.users) == False:
        socket.send("Nobody is online, please use REGISTER command" 
                 " in order to register into the server")
    else:
        socket.send("ONLINE " + " " .join(self.users.keys()))    

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