USD invoice below 1 cent might not be settling properly

[nicolasburtey]

from our slack:

lnInvoicePaymentSend with Invoice below 0.01$ i.e. 21 sats, the error message was initially misleading. Obviously we cannot payout below 0.01$  from USD wallet. Refering to unfound route confused.
{
  "data": {
    "lnInvoicePaymentSend": {
      "errors": [
        {
          "message": "Unable to find a route for payment."
        }
      ],
      "status": "FAILURE"
    }
  }
}

[nicolasburtey]

@UncleSamtoshi can you have a look once the facade is merged?

[nicolasburtey]

done by @vindard