linting mistakes corrected

Author: FarhanAnjum-opti

lib/optimizely/helpers/validator.rb

@@ -122,11 +122,11 @@ def inputs_valid?(variables, logger = NoOpLogger.new, level = Logger::ERROR)
 
         return false unless variables.respond_to?(:each) && !variables.empty?
 
-        is_valid = true
+        is_valid = true # rubocop:disable Lint/UselessAssignment
         if variables.include? :user_id
           # Empty str is a valid user ID.
           unless variables[:user_id].is_a?(String)
-            is_valid = false
+            is_valid = false # rubocop:disable Lint/UselessAssignment
             logger.log(level, "#{Constants::INPUT_VARIABLES['USER_ID']} is invalid")
           end
           variables.delete :user_id

lib/optimizely/optimizely_factory.rb

@@ -142,7 +142,6 @@ def self.custom_instance( # rubocop:disable Metrics/ParameterLists
       notification_center = nil,
       settings = nil
     )
-
       error_handler ||= NoOpErrorHandler.new
       logger ||= NoOpLogger.new
       notification_center = notification_center.is_a?(Optimizely::NotificationCenter) ? notification_center : NotificationCenter.new(logger, error_handler)