fix(oohelper): do not stop if DNS fails locally #450
Merged
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Location of the issue tracker: https://github.com/ooni/probe
Description
When a probe gets a local DNS failure, it will continue and nonetheless
query the test helper without any IP address, just an empty list.
This diff fixes the behavior of cmd/oohelper to do the same.
Work part of ooni/probe#1707.