Add a better check on networkMaps

lib/networks.js

@@ -60,12 +60,14 @@ _.extend(testnet, {
 var networkMaps = {};
 
 _.each(_.values(livenet), function(value) {
-  if (_.isArray(value)) return;
+  if (!_.isObject(value)) {
     networkMaps[value] = livenet;
+  }
 });
 _.each(_.values(testnet), function(value) {
-  if (_.isArray(value)) return;
+  if (!_.isObject(value)) {
     networkMaps[value] = testnet;
+  }
 });
 
 /**