fix: add safety checks to path display and tree selection to prevent runtime errors during object destruction

sharepoint_browser.py

@@ -239,6 +239,10 @@ class SharePointApp(wx.Frame):
         self.update_path_display()
 
     def update_path_display(self):
+        if not self:
+            return
+        
+        try:
             self.path_sizer.Clear(True)
             
             # Find alle noder fra rod til nuværende selektion
@@ -263,6 +267,9 @@ class SharePointApp(wx.Frame):
             self.path_panel.Layout()
             self.path_panel.Refresh()
             self.Layout() # Tving rammen til at opdatere, så stien kommer frem
+        except RuntimeError:
+            # Sker oftest ved lukning hvor objekter er slettet
+            pass
 
     def _add_path_segment(self, label, node):
         btn = wx.Button(self.path_panel, label=label, style=wx.BU_EXACTFIT | wx.BORDER_NONE)
@@ -429,6 +436,7 @@ class SharePointApp(wx.Frame):
             return
             
         self.current_path = data["path"]
+        if self:
             self.update_path_display()
         
         if not self.is_navigating_back:
@@ -518,6 +526,9 @@ class SharePointApp(wx.Frame):
 
     def _sync_tree_selection(self, target_id):
         selected = self.tree_ctrl.GetSelection()
+        if not selected.IsOk():
+            selected = self.tree_root
+            
         if selected.IsOk():
             data = self.tree_item_data.get(selected)
             if data and not data.get("loaded"):