Old RSS_reader script started failing

[ihf]

Traceback (most recent call last):
File "/private/var/mobile/Containers/Shared/AppGroup/05D14C00-CCAC-4E98-A3CC-96C6944B8534/Pythonista3/Documents/RSS_Reader.py", line 43, in tableview_did_select
table_view.navigation_view.push_view(tv)
AttributeError: 'NoneType' object has no attribute 'push_view'