ab_test must return metadata on error or if split is disabled/excluded user #622
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Split returns 'control' when disabled/excluded users/redis connection issues.
Before: Split yield {} as metadata even if there was one available.
After: If there's a metadata associated with the alternative, split will yield the metadata.
This will also make the behavior consistent between all scenarios. Unless the metadata is not defined on the configuration files.
ExperimentCatalog.find_or_initialize does not make any redis calls, so it's safe to use 'experiment' because it loads data from configuration.
Fixes #618