Require possible EE extension

spec/support/helpers/stub_configuration.rb

@@ -121,5 +121,7 @@ module StubConfiguration
   end
 end
 
-require_relative '../../../ee/spec/support/helpers/ee/stub_configuration'
+require_relative '../../../ee/spec/support/helpers/ee/stub_configuration' if
+  Dir.exist?("#{__dir__}/../../../ee")
+
 StubConfiguration.prepend(EE::StubConfiguration)

spec/support/helpers/stub_object_storage.rb

@@ -74,5 +74,7 @@ module StubObjectStorage
   end
 end
 
-require_relative '../../../ee/spec/support/helpers/ee/stub_object_storage'
+require_relative '../../../ee/spec/support/helpers/ee/stub_object_storage' if
+  Dir.exist?("#{__dir__}/../../../ee")
+
 StubObjectStorage.prepend(EE::StubObjectStorage)