Use simpler 'if-present' syntax instead of 'unless-nil' construct

Co-authored-by: Mike McQuaid <[email protected]>

Author: vraravam

Library/Homebrew/cask/cask_loader.rb

@@ -350,7 +350,7 @@ def load(config:)
           end
           desc json_cask[:desc]
           homepage json_cask[:homepage]
-          login_items json_cask[:login_items] unless json_cask[:login_items].nil?
+          login_items json_cask[:login_items] if json_cask[:login_items].present?
 
           if (deprecation_date = json_cask[:deprecation_date].presence)
             reason = DeprecateDisable.to_reason_string_or_symbol json_cask[:deprecation_reason], type: :cask