ooni crashes if no collector option is used with several decks

This issue was automatically migrated from github issue https://github.com/TheTorProject/ooni-probe/issues/274.

Also fails with data/decks/fast_no_root.deck.

When ooni-probe is run without a bouncer (-n), decks that depend upon learning about test helpers should either fail gracefully with a message. Optionally, we could skip such tests and run the remaining tests that do not need test helpers.

Log opened.
[D] Tor is not running. Skipping IP lookup via Tor.
[D] Cannot determine the probe IP address with a traceroute, becase of insufficient priviledges
Looking up your IP address via torproject
Not reporting using a collector
[D] Checking if backend is present
[!] Missing required option: "backend"
Traceback (most recent call last):
  File "bin/ooniprobe", line 17, in <module>
    runWithDirector()
  File "/home/ooni/ooni-probe/ooni/oonicli.py", line 161, in runWithDirector
    print net_test_loader.usageOptions().getUsage()
UnboundLocalError: local variable 'net_test_loader' referenced before assignment```

added component::archived/ooni owner::hellais priority::medium resolution::duplicate status::closed type::defect labels

This has already been migrated and is hence a duplicate.

Trac:
Status: new to closed
Description: This issue was automatically migrated from github issue https://github.com/TheTorProject/ooni-probe/issues/274.

Also fails with data/decks/fast_no_root.deck.

When ooni-probe is run without a bouncer (-n), decks that depend upon learning about test helpers should either fail gracefully with a message. Optionally, we could skip such tests and run the remaining tests that do not need test helpers.

Log opened.
[D] Tor is not running. Skipping IP lookup via Tor.
[D] Cannot determine the probe IP address with a traceroute, becase of insufficient priviledges
Looking up your IP address via torproject
Not reporting using a collector
[D] Checking if backend is present
[!] Missing required option: "backend"
Traceback (most recent call last):
  File "bin/ooniprobe", line 17, in <module>
    runWithDirector()
  File "/home/ooni/ooni-probe/ooni/oonicli.py", line 161, in runWithDirector
    print net_test_loader.usageOptions().getUsage()
UnboundLocalError: local variable 'net_test_loader' referenced before assignment``` 

**to**

 This issue was automatically migrated from github issue https://github.com/TheTorProject/ooni-probe/issues/274.

Also fails with data/decks/fast_no_root.deck.

When ooni-probe is run without a bouncer (-n), decks that depend upon learning about test helpers should either fail gracefully with a message. Optionally, we could skip such tests and run the remaining tests that do not need test helpers.
```ooniprobe -n -i data/decks/complete_no_root.deck 
Log opened.
[D] Tor is not running. Skipping IP lookup via Tor.
[D] Cannot determine the probe IP address with a traceroute, becase of insufficient priviledges
Looking up your IP address via torproject
Not reporting using a collector
[D] Checking if backend is present
[!] Missing required option: "backend"
Traceback (most recent call last):
  File "bin/ooniprobe", line 17, in <module>
    runWithDirector()
  File "/home/ooni/ooni-probe/ooni/oonicli.py", line 161, in runWithDirector
    print net_test_loader.usageOptions().getUsage()
UnboundLocalError: local variable 'net_test_loader' referenced before assignment```   
**Resolution**: *N/A* **to** duplicate

closed