removed some false/positive error message from the UI.

UI/Instrumentation/ErrorHandler.js

@@ -68,7 +68,8 @@
         };
 
         if (xmlHttpRequest.status === 0 && xmlHttpRequest.readyState === 0) {
-            message.message = 'NzbDrone Server Not Reachable. make sure NzbDrone is running.';
+            return false;
+            //message.message = 'NzbDrone Server Not Reachable. make sure NzbDrone is running.';
         } else {
             message.message = "[{0}] {1} : {2}".format(ajaxOptions.type, xmlHttpRequest.statusText, ajaxOptions.url);
         }

UI/Shared/Toolbar/Button/ButtonView.js

@@ -52,7 +52,10 @@ define(['app', 'Config', 'Commands/CommandController', 'Shared/Messenger'], func
                     }
                 });
 
-                commandPromise.fail(function () {
+                commandPromise.fail(function (options) {
+                    if (options.readyState === 0 || options.status === 0) {
+                        return;
+                    }
                     if (self.model.get('errorMessage')) {
                         NzbDrone.Shared.Messenger.show({
                             message: self.model.get('errorMessage'),
@@ -62,9 +65,11 @@ define(['app', 'Config', 'Commands/CommandController', 'Shared/Messenger'], func
                 });
 
                 commandPromise.always(function () {
+                    if (!self.isClosed) {
                         self.$el.removeClass('disabled');
                         self.ui.icon.removeClass('icon-spinner icon-spin');
                         self.idle = true;
+                    }
                 });
             }
         },