Fixed crash on add item via favorite button after application start.

Favorite buttons has short name labels.
closes #296
refs #293

shop/shopform.cpp

@@ -83,6 +83,7 @@ void ShopForm::loadLast()
     m_commodityModel->setData(srv.allSellableItems());
     ui->commodityTable->horizontalHeader()->setSectionResizeMode(1, QHeaderView::Stretch);
     ui->commodityTable->setColumnHidden(3, true);
+    ui->commodityTable->setColumnHidden(2, true);
 
     if (srv.isEetEnabled())
     {
@@ -124,7 +125,7 @@ void ShopForm::loadButtons()
 
             if (btnMap[btnName] != NULL)
             {
-                btn->setText(btnMap[btnName]->name());
+                btn->setText(btnMap[btnName]->shortName());
                 connect(btn, &FavButton::clicked, [this, btnMap, btn](bool){
                     FavoritItemPtr item = btnMap[btn->objectName()];
 
@@ -161,11 +162,6 @@ void ShopForm::fillRaceiptCombo()
 
 void ShopForm::on_directSale_clicked()
 {
-    if (m_voucher.isNull())
-    {
-        createVoucher();
-    }
-
     DirectSaleForm *form = new DirectSaleForm(this);
     form->setAttribute(Qt::WA_DeleteOnClose);
 
@@ -357,6 +353,11 @@ void ShopForm::createEmptyVoucher()
 
 void ShopForm::addItem(QSharedPointer<IShopItem> item, int count)
 {
+    if (m_voucher.isNull())
+    {
+        createVoucher();
+    }
+
     ShopService srv;
     srv.addShopItem(m_voucher, item, count);
     this->m_itemsModel->addRow(m_voucher->items()[m_voucher->items().count() - 1]);
@@ -443,11 +444,6 @@ void ShopForm::on_showPaiedButton_clicked()
 
 void ShopForm::on_btnAddItem_clicked()
 {
-    if (m_voucher.isNull())
-    {
-        createVoucher();
-    }
-
     ShopItemPtr item = m_commodityModel->itemFromIndex(ui->commodityTable->currentIndex());
     addItem(item, ui->spnCount->value());
 }