Exception thrown when approvals are being used

This seems to happen when delayed updates are configured.

2020-11-13 13:59:48 info updater-supervisor[]: Traceback (most recent call last):
   File "/usr/bin/updater-supervisor", line 11, in <module>
    load_entry_point('svupdater==1.3.1', 'console_scripts', 'updater-supervisor')()
   File "/usr/lib/python3.7/site-packages/svupdater/__main__.py", line 103, in main
   File "/usr/lib/python3.7/site-packages/svupdater/_supervisor.py", line 160, in run
   File "/usr/lib/python3.7/site-packages/svupdater/_supervisor.py", line 77, in run
   File "/usr/lib/python3.7/site-packages/svupdater/approvals.py", line 157, in _approved
 TypeError: '>' not supported between instances of 'NoneType' and 'int'