[Qt] small cleanup of coincontroldialog

- use a little more Qt-style
- check for NULL pointers first and return in updateView()
- small space and formating changes

src/qt/coincontroldialog.cpp

@@ -434,7 +434,8 @@ void CoinControlDialog::updateLabelLocked()
 
 void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
 {
-    if (!model) return;
+    if (!model)
+        return;
 
     // nPayAmount
     qint64 nPayAmount = 0;
@@ -640,6 +641,9 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
 
 void CoinControlDialog::updateView()
 {
+    if (!model || !model->getOptionsModel() || !model->getAddressTableModel())
+        return;
+
     bool treeMode = ui->radioTreeMode->isChecked();
 
     ui->treeWidget->clear();
@@ -648,9 +652,7 @@ void CoinControlDialog::updateView()
     QFlags<Qt::ItemFlag> flgCheckbox = Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable;
     QFlags<Qt::ItemFlag> flgTristate = Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable | Qt::ItemIsTristate;
 
-    int nDisplayUnit = BitcoinUnits::BTC;
+    int nDisplayUnit = model->getOptionsModel()->getDisplayUnit();
-    if (model && model->getOptionsModel())
-        nDisplayUnit = model->getOptionsModel()->getDisplayUnit();
 
     map<QString, vector<COutput> > mapCoins;
     model->listCoins(mapCoins);
@@ -658,11 +660,10 @@ void CoinControlDialog::updateView()
     BOOST_FOREACH(PAIRTYPE(QString, vector<COutput>) coins, mapCoins)
     {
         QTreeWidgetItem *itemWalletAddress = new QTreeWidgetItem();
+        itemWalletAddress->setCheckState(COLUMN_CHECKBOX, Qt::Unchecked);
         QString sWalletAddress = coins.first;
-        QString sWalletLabel = "";
+        QString sWalletLabel = model->getAddressTableModel()->labelForAddress(sWalletAddress);
-        if (model->getAddressTableModel())
+        if (sWalletLabel.isEmpty())
-            sWalletLabel = model->getAddressTableModel()->labelForAddress(sWalletAddress);
-        if (sWalletLabel.length() == 0)
             sWalletLabel = tr("(no label)");
 
         if (treeMode)
@@ -722,10 +723,8 @@ void CoinControlDialog::updateView()
             }
             else if (!treeMode)
             {
-                QString sLabel = "";
+                QString sLabel = model->getAddressTableModel()->labelForAddress(sAddress);
-                if (model->getAddressTableModel())
+                if (sLabel.isEmpty())
-                    sLabel = model->getAddressTableModel()->labelForAddress(sAddress);
-                if (sLabel.length() == 0)
                     sLabel = tr("(no label)");
                 itemOutput->setText(COLUMN_LABEL, sLabel);
             }