ios: blank suite names in results filtering

[bassosimone]

Describe the bug

It seems there are blank suite names in results filtering.

To Reproduce

Run all nettests, then go to the results screen, attempt to filter by name and see the blank suite names.

Expected behavior

I would say there should be no blank suite names.

Screenshots

System information (please complete the following information):

• Device: iPhone SE (third generation) 2022
  • OS: iOS 16.5.1(c)
  • OONI Probe version: https://github.com/ooni/probe-ios/commit/8e59ca2238be6a4923bccf37a775adf1a024ac16

Additional context

N/A