fix for 0 records retrieved

lib/blockchainexplorer.js

@@ -47,8 +47,8 @@ function getTransactionsInsight(url, addresses, from, to, cb) {
   }, function(err, res, txs) {
     if (err || res.statusCode != 200) return cb(err || res);
     // NOTE: Whenever Insight breaks communication with bitcoind, it returns invalid data but no error code.
-    if (!_.isArray(txs) || _.compact(txs).length == 0) return cb(new Error('Could not retrieve transactions from blockchain'));
-   
+    if (!_.isArray(txs) || (txs.length != _.compact(txs).length)) return cb(new Error('Could not retrieve transactions from blockchain'));
+
     return cb(null, txs);
   });
 };