Commits on Jan 21, 2023

1. Gracefully degrade when ActionMailer::Base#params is nil …

   Prior to this change, access to `params` on `ActionMailer::Base`
   instances prior to being decorated by `ActionMailer::Parameterized.with`
   calls results in a `NoMethodError`:
   
   ```
   Error:
   ParameterizedTest#test_degrade_gracefully_when_.with_is_not_called:
   NoMethodError: undefined method `[]' for nil:NilClass
   
     before_action { @Inviter, @invitee = params[:inviter], params[:invitee] }
                                                ^^^^^^^^^^
   ```
   
   This change modifies the `attr_accessor :params` to be an `attr_writer`
   paired with a `params` method that assigns `@params` to an empty `Hash`
   whenever it's accessed without being otherwise initialized.

   

   seanpdoyle committed Jan 21, 2023
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