VLCCloudStorageTableViewController: Fix updating loop and thread issue

The CloudStorageTableViewController does not create a loop trying to
update the content of the view when there are no items to be displayed
anymore.

The adding and removing views calls are now dispatched to the main
queue to avoid crashes.

Author: diogo-simaomarques

Sources/VLCCloudStorageTableViewController.m

@@ -203,7 +203,9 @@ - (void)updateToolbarWithStyle:(VLCToolbarStyle)style {
             [items addObjectsFromArray:@[_numberOfFilesBarButtonItem, [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]]];
             break;
     }
-    [self setToolbarItems:items animated:YES];
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [self setToolbarItems:items animated:YES];
+    });
  }
 
 - (void)updateRemainingTime:(NSString *)time
@@ -269,7 +271,9 @@ - (void)updateViewAfterSessionChange
     }
     if (_authorizationInProgress || [self.controller isAuthorized]) {
         if (self.loginToCloudStorageView.superview) {
-            [self.loginToCloudStorageView removeFromSuperview];
+            dispatch_async(dispatch_get_main_queue(), ^{
+                [self.loginToCloudStorageView removeFromSuperview];
+            });
         }
     }
     if (![self.controller isAuthorized]) {
@@ -292,10 +296,6 @@ - (void)updateViewAfterSessionChange
     if (self.currentPath == nil) {
         self.currentPath = @"";
     }
-
-    if ([self.controller.currentListFiles count] == 0) {
-        [self requestInformationForCurrentPath];
-    }
 }
 
 - (void)logout