Gemfile in dor-services-client-10.1.0 vs Gemfile in dor-services-client-10.2.0

@@ -2,9 +2,9 @@
 
 source 'https://rubygems.org'
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
-gem 'activesupport', ENV['RAILS_VERSION'] if ENV['RAILS_VERSION']
+gem 'activesupport', ENV.fetch('RAILS_VERSION', nil) if ENV['RAILS_VERSION']
 
 # Specify your gem's dependencies in dor-services-client.gemspec
 gemspec