Fix Doorkeeper::AccessToken.find_or_create_for with empty scopes #414

Job	Run time
rails_edge	48s
ruby_edge (gemfiles/rails_6_0.gemfile)	1m 50s
Ruby 3.0 (gemfiles/rails_6_0.gemfile)	48s
ruby_edge (gemfiles/rails_6_1.gemfile)	1m 43s
Ruby 3.0 (gemfiles/rails_6_1.gemfile)	41s
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)	1m 46s
Ruby 3.0 (gemfiles/rails_7_1.gemfile)	3m 44s
Ruby 3.1 (gemfiles/rails_6_0.gemfile)	44s
Ruby 3.1 (gemfiles/rails_6_1.gemfile)	58s
Ruby 3.1 (gemfiles/rails_7_0.gemfile)	51s
Ruby 3.1 (gemfiles/rails_7_1.gemfile)	46s
Ruby 3.2 (gemfiles/rails_6_0.gemfile)	46s
Ruby 3.2 (gemfiles/rails_6_1.gemfile)	42s
Ruby 3.2 (gemfiles/rails_7_0.gemfile)	43s
Ruby 3.2 (gemfiles/rails_7_1.gemfile)	47s
Ruby truffleruby-head (gemfiles/rails_6_0.gemfile)	3m 33s
Ruby truffleruby-head (gemfiles/rails_6_1.gemfile)	3m 50s
Ruby truffleruby-head (gemfiles/rails_7_0.gemfile)	3m 52s
Ruby truffleruby-head (gemfiles/rails_7_1.gemfile)	3m 51s
	35m 6s

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