Python error at startup if working dir contains invalid folder

[leendertvanwolfswinkel]

If you unzip this folder into your 3Di working directory:

Prinseneiland 27.zip

You will get the error below.

I think the issue is that the "grid" sub-directory is missing. I think it should just ignore the folder and continue in this case

Probably is preferable to solve this issue in threedi-mi-utils

TypeError: expected str, bytes or os.PathLike object, not NoneType 
Traceback (most recent call last):
  File "C:\PROGRA~1/3DIMOD~1.28/apps/qgis-ltr/./python\qgis\utils.py", line 448, in startPlugin
    plugins[packageName].initGui()
  File "C:\Users\leendert.vanwolfswin\AppData\Roaming\3Di\QGIS3\profiles\3Di Staging/python/plugins\threedi_results_analysis\threedi_plugin.py", line 109, in initGui
    self.dockwidget = ThreeDiPluginDockWidget(None, iface)
  File "C:\Users\leendert.vanwolfswin\AppData\Roaming\3Di\QGIS3\profiles\3Di Staging/python/plugins\threedi_results_analysis\gui\threedi_plugin_dockwidget.py", line 63, in __init__
    self.dialog = ThreeDiPluginGridResultDialog(self)
  File "C:\Users\leendert.vanwolfswin\AppData\Roaming\3Di\QGIS3\profiles\3Di Staging/python/plugins\threedi_results_analysis\gui\threedi_plugin_grid_result_dialog.py", line 66, in __init__
    self.refresh()
  File "C:\Users\leendert.vanwolfswin\AppData\Roaming\3Di\QGIS3\profiles\3Di Staging/python/plugins\threedi_results_analysis\gui\threedi_plugin_grid_result_dialog.py", line 222, in refresh
    if num_of_results == 0 and os.path.exists(os.path.join(local_revision.grid_dir, "gridadmin.h5")):
  File "C:\PROGRA~1\3DIMOD~1.28\apps\Python39\lib\ntpath.py", line 78, in join
    path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not NoneType