UI: only show chapter button when chapter info available

mainwindow.cpp

@@ -61,6 +61,7 @@ MainWindow::MainWindow(QWidget *parent)
     m_mediaPlayer->setLoops(QMediaPlayer::Infinite);
     ui->playlistView->setModel(m_playlistManager->model());
 
+    ui->chapterNameBtn->setVisible(false);
     ui->chapterlistView->setModel(ui->playbackProgressIndicator->chapterModel());
     ui->chapterlistView->setRootIsDecorated(false);
 
@@ -527,10 +528,14 @@ void MainWindow::initConnections()
                 ui->chapterNameBtn->setText(currentChapterName);
                 lastChapterName = currentChapterName;
             }
-        } else if (!lastChapterName.isEmpty()) {
+            ui->chapterNameBtn->setVisible(true);
+        } else {
+            if (!lastChapterName.isEmpty()) {
                 ui->chapterNameBtn->setText("");
                 lastChapterName.clear();
             }
+            ui->chapterNameBtn->setVisible(false);
+        }
     });
 
     connect(m_audioOutput, &QAudioOutput::mutedChanged, this, [=](bool muted) {

mainwindow.ui

@@ -714,7 +714,7 @@ QHeaderView {
     <string>About</string>
    </property>
    <property name="shortcut">
-    <string>F1</string>
+    <string notr="true">F1</string>
    </property>
    <property name="menuRole">
     <enum>QAction::AboutRole</enum>
@@ -728,7 +728,7 @@ QHeaderView {
     <string>Open</string>
    </property>
    <property name="shortcut">
-    <string>Ctrl+O</string>
+    <string notr="true">Ctrl+O</string>
    </property>
    <property name="menuRole">
     <enum>QAction::NoRole</enum>