Make `Redis::Wrapper#_raw_config` and `#fetch_config` more resilient
These two methods now handle two additional real-world possibilities:
-
config/resque.yml
not being present -
config/resque.yml
being present but not containing YAML
These two methods now handle two additional real-world possibilities:
config/resque.yml
not being presentconfig/resque.yml
being present but not containing YAML