Added warning message about empty callsign before transmitting

mainwindow.cpp

@@ -5776,7 +5776,20 @@ void MainWindow::resetMessageUI(){
     }
 }
 
+bool MainWindow::ensureCallsignSet(){
+    if(m_config.my_callsign().trimmed().isEmpty()){
+        MessageBox::warning_message(this, tr ("Please enter your callsign in the settings."));
+        return false;
+    }
+
+    return true;
+}
+
 void MainWindow::createMessage(QString const& text){
+    if(!ensureCallsignSet()){
+        on_stopTxButton_clicked();
+        return;
+    }
     resetMessageTransmitQueue();
     createMessageTransmitQueue(text);
 }

mainwindow.h

@@ -140,6 +140,7 @@ public slots:
   void resetMessage();
   void resetMessageUI();
   void restoreMessage();
+  bool ensureCallsignSet();
   void createMessage(QString const& text);
   void createMessageTransmitQueue(QString const& text);
   void resetMessageTransmitQueue();