How do I condense unwrapping multiple optionals in Swift?

I want to unwrap these 6 optional variables, and if they are null i want to give them a blank String value. This is so I can send these variables packaged into a parameters array that's sent to an API.

I'm still a beginner at Swift, and this is the only easiest way I have understood how to implement this, but the inner coder in me is saying this looks redundant and crappy as ****.

Can someone help me condense this or make it simpler?

    if let fbEmail = self.fbEmail {

    }else{
        self.fbEmail = ""
    }

    if let fbDob = self.fbDob {

    }else{
        self.fbDob = ""
    }

    if let fbGender = self.fbGender {

    }else{
        self.fbGender = ""
    }
    if let fbUserIp = self.fbUserIp {

    }else{
        self.fbUserIp = ""
    }
    if let fbFacebookId = self.fbFacebookId {

    }else{
        self.fbFacebookId = ""
    }
    if let fbFacebookAccessToken = self.fbFacebookAccessToken {

    }else{
        self.fbFacebookAccessToken = ""
    }