Fix the infinite spinner bug with the file manager store

www/slide/main.js

@@ -59,6 +59,11 @@ define([
 
         var presentMode = Slide.isPresentURL();
 
+        var onConnectError = function (info) {
+            module.spinner.hide();
+            Cryptpad.alert(Messages.websocketError);
+        };
+
         var andThen = function (CMeditor) {
             var CodeMirror = module.CodeMirror = CMeditor;
             CodeMirror.modeURL = "/bower_components/codemirror/mode/%N/%N.js";
@@ -786,10 +791,7 @@ define([
                 }
             };
 
-            var onError = config.onError = function (info) {
-                module.spinner.hide();
-                Cryptpad.alert(Messages.websocketError);
-            };
+            var onError = config.onError = onConnectError;
 
             var realtime = module.realtime = Realtime.start(config);
 
@@ -803,6 +805,11 @@ define([
                 // TODO handle error
                 andThen(CM);
             });
+            Cryptpad.onError(function (info) {
+                if (info && info.type === "store") {
+                    onConnectError();
+                }
+            });
         };
 
         var first = function () {