Create new rpc connection during shutdown if we don't have one and debug logging

src/mainwindow.cpp

@@ -434,8 +434,12 @@ void MainWindow::closeEvent(QCloseEvent* event) {
 
 void MainWindow::closeEventpw(QCloseEvent* event) {
     // Let the RPC know to shut down any running service.
-    qDebug() << __func__ << ": event=" << event;
-    rpc->shutdownhushd();
+    qDebug() << __func__ << ": event=" << event << " this=" << this;
+    if (rpc) {
+        rpc->shutdownhushd();
+    } else {
+        qDebug() << __func__ << ": invalid rpc object!";
+    }
 }
 
 void MainWindow::encryptWallet() {
@@ -444,6 +448,8 @@ void MainWindow::encryptWallet() {
     Ui_encryptionDialog ed;
     ed.setupUi(&d);
 
+    qDebug() << __func__ << ": start";
+
     // Handle edits on the password box
     
     auto fnPasswordEdited = [=](const QString&) {
@@ -500,6 +506,7 @@ void MainWindow::encryptWallet() {
                     QString("Please close some other programs to free up memory and try again"),
                     QMessageBox::Ok
                 ); 
+                qDebug() << __func__ << ": out of memory!";
                 exit(1);
         }
         QString passphraseHash1 = QByteArray(reinterpret_cast<const char*>(key), KEY_LEN).toHex();
@@ -520,6 +527,7 @@ void MainWindow::encryptWallet() {
                     QMessageBox::Ok
                 ); 
     }
+    qDebug() << __func__ << ": finish";
 }
 
 void MainWindow::removeWalletEncryption() {