FIX: Issue spyder-ide#17221

Fixes the issue with the file name label not being updated when
the last tab is closed in the editor.

spyder/plugins/editor/widgets/editor.py

@@ -1643,6 +1643,7 @@ def close_file(self, index=None, force=False):
 
         if self.get_stack_count() == 0 and self.create_new_file_if_empty:
             self.sig_new_file[()].emit()
+            self.update_fname_label()
             return False
         self.__modify_stack_title()
         return is_ok