Simone Basso 560b1a9a97
fix(filtering): avoid the if err == nil pattern (#567)
1. in normal code is better to always do if err != nil so that
the ifs only contain error code (this is ~coding policy)

2. in tests we want to ensure we narrow down the error to the
real error that happened, to have greater confidence

Written while working on https://github.com/ooni/probe/issues/1803#issuecomment-957323297
2021-11-02 19:48:10 +01:00
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