Send the error to chainpad when a patch is not sent

www/common/outer/async-store.js

@@ -1599,7 +1599,10 @@ define([
                 onConnect: function (wc, sendMessage) {
                     channel.sendMessage = function (msg, cId, cb) {
                         // Send to server
-                        sendMessage(msg, function () {
+                        sendMessage(msg, function (err) {
+                            if (err) {
+                                return void cb({ error: err });
+                            }
                             // Broadcast to other tabs
                             channel.pushHistory(CpNetflux.removeCp(msg), /^cp\|/.test(msg));
                             channel.bcast("PAD_MESSAGE", {

www/common/sframe-chainpad-netflux-inner.js

@@ -60,7 +60,8 @@ define([
         });
         chainpad.onMessage(function(message, cb) {
             // -1 ==> no timeout, we may receive the callback only when we reconnect
-            sframeChan.query('Q_RT_MESSAGE', message, function (err) {
+            sframeChan.query('Q_RT_MESSAGE', message, function (_err, obj) {
+                var err = _err || (obj && obj.error);
                 if (!err) { evPatchSent.fire(); }
                 cb(err);
             }, { timeout: -1 });