Merge pull request #2047 from koic/fix_unintended_document_changes_caused_by_default_rake_task

[Fix #2044] Fix unintended document changes caused by default Rake task

Author: bquorning

tasks/cops_documentation.rake

@@ -12,7 +12,10 @@ end
 
 desc 'Generate docs of all cops departments'
 task generate_cops_documentation: :yard_for_generate_documentation do
-  RuboCop::ConfigLoader.inject_defaults!("#{__dir__}/../config/default.yml")
+  loaded_plugins = RuboCop::ConfigLoader.default_configuration.loaded_plugins
+  if loaded_plugins.none? { |plugin| plugin.about.name == 'rubocop-rspec' }
+    RuboCop::ConfigLoader.inject_defaults!("#{__dir__}/../config/default.yml")
+  end
 
   generator = CopsDocumentationGenerator.new(
     departments: %w[RSpec]