message: [GUI] Dashboard screen, hide tx filters when the wallet doesn't have any transaction.
diff: @@ -37,8 +37,7 @@ DashboardWidget::DashboardWidget(PIVXGUI* parent) :
  this->setContentsMargins(0,0,0,0);
  // Containers
  - setCssProperty(this, "container");
  - setCssProperty(ui->left, "container");
  + setCssProperty({this, ui->left}, "container");
  ui->left->setContentsMargins(0,0,0,0);
  setCssProperty(ui->right, "container-right");
  ui->right->setContentsMargins(20,20,20,0);
  @@ -203,6 +202,8 @@ void DashboardWidget::loadWalletModel(){
  if(txModel->size() == 0){
  ui->emptyContainer->setVisible(true);
  ui->listTransactions->setVisible(false);
  + ui->comboBoxSortType->setVisible(false);
  + ui->comboBoxSort->setVisible(false);
  }
  connect(ui->pushImgEmpty, SIGNAL(clicked()), window, SLOT(openFAQ()));
  @@ -231,6 +232,8 @@ void DashboardWidget::showList(){
  if (ui->emptyContainer->isVisible()) {
  ui->emptyContainer->setVisible(false);
  ui->listTransactions->setVisible(true);
  + ui->comboBoxSortType->setVisible(true);
  + ui->comboBoxSort->setVisible(true);
  }
  }
  