[#3553568] feat: Warning is emitted when no targets are configured

Rudolf Bykerrequested to merge
issue/logger-3553568:3553568-warning-is-emitted into 1.0.x

Provide sensible fallbacks for missing config values. Add functional tests to ensure that:

  • the default config works
  • it works when there are zero targets
  • it works when the config data is completely empty

Closes #3553568

Edited by Rudolf Byker

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