Remove unused ADDITIONAL_GEMS variable

Author: Vidas P

Gemfile

@@ -149,9 +149,3 @@ ENV['DATABASE_ADAPTER'] ||=
 if_true(ENV['DATABASE_ADAPTER'].strip == 'postgresql') do
   gem 'pg', '~> 1.1.4'
 end
-
-require File.join(File.dirname(__FILE__), 'lib/gemfile_helper.rb')
-
-GemfileHelper.parse_each_agent_gem(ENV['ADDITIONAL_GEMS']) do |args|
-  gem *args
-end

app/views/application/undefined_agents.html.erb

@@ -23,15 +23,13 @@
         </p>
         <ul>
           <li>If the respective Agent is distributed as part of the ActiveWorkflow application codebase, it may have been removed or moved to an Agent gem.</li>
-          <li>If the respective Agent is distributed as a Ruby gem, it might have been removed from the <code>ADDITIONAL_GEMS</code> environment setting.</li>
         </ul>
         <br/>
         <p>
           You can fix this issue by:
         </p>
         <ul>
           <li>deleting the respective Agent(s) from the database using the button below.</li>
-          <li>adding the respective Agent(s) to the the <code>ADDITIONAL_GEMS</code> environment setting</li>
         </ul>
         <br/>
         <div>