Fix last lint problems

Author: esrakartalOpt

lib/optimizely/config/datafile_project_config.rb

@@ -209,8 +209,8 @@ def initialize(datafile, logger, error_handler)
       end
 
       # Adding Holdout variations in variation id and key maps
-      return [] unless @holdouts && !@holdouts.empty?
-        
+      return unless @holdouts && !@holdouts.empty?
+
       @holdouts.each do |holdout|
         holdout_key = holdout['key']
         holdout_id = holdout['id']

spec/decision_service_spec.rb

@@ -1508,7 +1508,7 @@
           h['includedFlags'].nil? || h['includedFlags'].empty?
         end
 
-        if !global_holdouts.empty?
+        unless global_holdouts.empty?
           user_context = project_with_holdouts.create_user_context('testUserId', {})
 
           _result = decision_service_with_holdouts.get_variations_for_feature_list(