Fix Doorkeeper::AccessToken.find_or_create_for with empty scopes #413

Job	Run time
rails_edge	52s
ruby_edge (gemfiles/rails_6_0.gemfile)	1m 50s
Ruby 3.0 (gemfiles/rails_6_0.gemfile)	42s
ruby_edge (gemfiles/rails_6_1.gemfile)	1m 49s
Ruby 3.0 (gemfiles/rails_6_1.gemfile)	40s
ruby_edge (gemfiles/rails_7_0.gemfile)	1m 41s
Ruby 3.0 (gemfiles/rails_7_0.gemfile)	42s
ruby_edge (gemfiles/rails_7_1.gemfile)	2m 16s
Ruby 3.0 (gemfiles/rails_7_1.gemfile)	40s
Ruby 3.1 (gemfiles/rails_6_0.gemfile)	44s
Ruby 3.1 (gemfiles/rails_6_1.gemfile)	50s
Ruby 3.1 (gemfiles/rails_7_0.gemfile)	47s
Ruby 3.1 (gemfiles/rails_7_1.gemfile)	47s
Ruby 3.2 (gemfiles/rails_6_0.gemfile)	44s
Ruby 3.2 (gemfiles/rails_6_1.gemfile)	49s
Ruby 3.2 (gemfiles/rails_7_0.gemfile)	42s
Ruby 3.2 (gemfiles/rails_7_1.gemfile)	51s
Ruby truffleruby-head (gemfiles/rails_6_0.gemfile)	3m 22s
Ruby truffleruby-head (gemfiles/rails_6_1.gemfile)	3m 38s
Ruby truffleruby-head (gemfiles/rails_7_0.gemfile)	3m 37s
Ruby truffleruby-head (gemfiles/rails_7_1.gemfile)	3m 38s
	31m 41s

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