fix bug for path's name when saving GPS file

sohstationviewer/view/plotting/gps_plot/gps_dialog.py

@@ -190,7 +190,7 @@ class GPSDialog(QtWidgets.QWidget):
         super().__init__()
         self.parent = parent
 
-        self.data_path: Optional[Path] = None
+        self.data_path: Optional[Path, str] = None
         # The directory the GPS will be exported to. By default, this will be
         # the folder that contains the data set.
         self.export_path: Path = Path.home()
@@ -353,8 +353,10 @@ class GPSDialog(QtWidgets.QWidget):
             msg = 'There is no GPS data to export.'
             display_tracking_info(self.info_text_browser, msg, LogType.ERROR)
             return
-
-        folder_name = self.data_path.name
+        try:
+            folder_name = self.data_path.name
+        except AttributeError:
+            folder_name = self.data_path.split(os.sep)[-1]
         export_file_path = self.export_path / f'{folder_name}.gps.dat'
 
         try: