rails/railtie: read adapter info without requiring an active DB conn #1224
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Fixes #1222
(Airbrake Gem Attempts to Connect to Database in Databaseless App in Rails 6)
Good article:
https://www.bigbinary.com/blog/rails-6-changed-activerecord-base-configurations-result-to-an-object
We also add a guard that makes sure there's an ActiveRecord configuration
present (it can be that ActiveRecord is required but not configured; why? I have
no idea but it did happen to our customer and he's got no clue either).