Apply suggestions from pull request thread

Co-authored-by: Morten Brekkevold <[email protected]>

python/nav/web/seeddb/page/netbox/edit.py

@@ -291,12 +291,7 @@ def netbox_do_save(form):
  func.value = function
  func.save()
  elif function == '':
- try:
- func = NetboxInfo.objects.get(netbox=netbox, variable='function')
- except NetboxInfo.DoesNotExist:
- pass
- else:
- func.delete()
+ NetboxInfo.objects.filter(netbox=netbox, variable='function').delete()
 
  # Save the groups
  netboxgroups = form.cleaned_data['groups']