fix 500 page on users:

'NoneType' object has no attribute 'strftime'

BaseModelView.index_view() got an unexpected keyword argument 'cls'

Flask-SQLAlchemy uses a custom formatter to handle date formatting when displaying data in the templates. It dosn't support overriding the value.

spkrepo/views/admin.py

@@ -44,10 +44,6 @@ def is_accessible(self):
     # View
     column_list = ("username", "email", "roles", "active", "confirmed_at")
 
-    column_formatters = {
-        "confirmed_at": lambda v, c, m, p: m.confirmed_at.strftime("%Y-%m-%d %H:%M:%S")
-    }
-
     # Form
     form_columns = ("username", "roles", "active")
     form_overrides = {"password": PasswordField}