fix startup bug where rates weren't available

lib/error.js

@@ -17,3 +17,4 @@ function register (errorName) {
 }
 
 register('BadNumberError')
+register('NoDataError')

lib/routes.js

@@ -3,6 +3,8 @@
 var BigNumber = require('bignumber.js')
 var logger = require('./logger')
 
+var E = require('./error')
+
 var mock = false
 
 var plugins
@@ -34,7 +36,7 @@ function buildRates () {
   var rates = {}
   cryptoCodes.forEach(function (cryptoCode) {
     var _rate = plugins.getDeviceRate(cryptoCode)
-    if (!_rate) return
+    if (!_rate) throw new E.NoDataError('No rate for ' + cryptoCode + ' yet')
     var rate = _rate.rates
     rates[cryptoCode] = {
       cashIn: rate.ask.times(cashInCommission),
@@ -51,6 +53,7 @@ function buildBalances () {
   var _balances = {}
   cryptoCodes.forEach(function (cryptoCode) {
     var balance = plugins.fiatBalance(cryptoCode)
+    if (!balance) throw new E.NoDataError('No balance for ' + cryptoCode + ' yet')
     _balances[cryptoCode] = balance
   })
 
@@ -65,8 +68,18 @@ function poll (req, res) {
 
   logger.debug('poll request from: %s', fingerprint)
 
-  var rates = buildRates()
-  var balances = buildBalances()
+  var rates
+  var balances
+
+  try {
+    rates = buildRates()
+    balances = buildBalances()
+  } catch (e) {
+    if (e instanceof E.NoDataError) {
+      logger.debug(e)
+      return res.send(500)
+    }
+  }
 
   var config = plugins.getConfig()
   var settings = config.exchanges.settings