Fixing sort to only be if not false

Fixes #23

lib/api.js

@@ -355,8 +355,13 @@ app.get('/miner/:address/chart/hashrate', function (req, res) {
 
 app.get('/miner/:address/chart/hashrate/allWorkers', function (req, res) {
     let address = req.params.address;
-    let identifiers = global.database.getCache(address + '_identifiers').sort();
+    let identifiers = global.database.getCache(address + '_identifiers');
     let returnData = {global: global.database.getCache(req.params.address)['hashHistory']};
+    if (identifiers !== false){
+        identifiers.sort();
+    } else {
+        return res.json(returnData);
+    }
     let intCounter = 0;
     identifiers.forEach(function(identifier){
         returnData[identifier] = global.database.getCache(req.params.address+"_"+identifier)['hashHistory'];