Fixed some crashs that occurred when clicking on the tab bar, but not on a tab.

wobuzz/ui/playlist_tabs/tab_bar.py

@@ -26,6 +26,9 @@ class PlaylistTabBar(QTabBar):
         self.tab_widget.setCurrentIndex(index)
 
     def on_click(self, index):
+        if index == -1:  # do nothing if no tab was clicked
+            return
+
         playlist_view = self.tab_widget.widget(index)
         playlist = playlist_view.playlist
 
@@ -38,10 +41,16 @@ class PlaylistTabBar(QTabBar):
         self.app.player.start_playlist(playlist)
 
     def contextMenuEvent(self, event: QContextMenuEvent, title=None):
+        # get title by self.tabAt() if the event is called from PyQt, else its executed from the tab title and getting
+        # the index by tabAt() wouldn't be possible
         if title is None:
             pos = event.pos()
 
             index = self.tabAt(pos)
+
+            if index == -1:  # when no tab was clicked, do nothing
+                return
+
             title = self.tabButton(index, QTabBar.ButtonPosition.RightSide)
 
         self.context_menu.exec(event.globalPos(), title)