Try another server if current is down when saving wallet via a rescan

src/connection.cpp

@@ -364,12 +364,11 @@ void Executor::run()
         nullptr,
         false
     );
-    if (parsed.is_discarded() || parsed.is_null())
+    if (parsed.is_discarded() || parsed.is_null()) {
         emit handleError(reply);
-
-    else
-
-    emit responseReady(parsed);
+    } else {
+        emit responseReady(parsed);
+    }
 }
 
 void Callback::processRPCCallback(json resp)

src/mainwindow.cpp

@@ -217,6 +217,7 @@ MainWindow::MainWindow(QWidget *parent) :
         } catch (const std::exception& e)  {
             qDebug() << __func__ << ": caught an exception, ignoring: " << e.what();
         }
+
         if (reply.toUpper().trimmed() != "OK") {
                 qDebug() << "Lite server " << config->server << " is down, getting a random one";
                 config->server = Settings::getRandomServer();
@@ -237,8 +238,32 @@ MainWindow::MainWindow(QWidget *parent) :
 
     // 4. Finally attempt to save the wallet
     {
-        char* resp = litelib_execute("save", "");
-        QString reply = litelib_process_response(resp);
+        QString reply = "";
+        try {
+            char* resp = litelib_execute("save", "");
+            QString reply = litelib_process_response(resp);
+        } catch (const std::exception& e)  {
+            qDebug() << __func__ << ": caught an exception, ignoring: " << e.what();
+        }
+
+        if (reply.toUpper().trimmed() != "OK") {
+                qDebug() << "Lite server " << config->server << " is down, getting a random one";
+                config->server = Settings::getRandomServer();
+                qDebug() << __func__ << ": new server is " << config->server;
+                // make a new connection to the new server
+                char* resp = litelib_initialize_new_from_phrase(config->dangerous,config->server.toStdString().c_str(),
+                    seed.toStdString().c_str(), birthday, number);
+                reply = litelib_process_response(resp);
+
+                // retry with the new server
+                try {
+                    resp = litelib_execute("save", "");
+                    reply = litelib_process_response(resp);
+                } catch (const std::exception& e)  {
+                    qDebug() << __func__ << ": caught an exception with new server, something is fucky: " << e.what();
+                }
+        }
+
 
         QByteArray ba_reply = reply.toUtf8();
         QJsonDocument jd_reply = QJsonDocument::fromJson(ba_reply);