Allow work form to display when wings is disabled

When `disable_wings=true`, the `Wings` constant is not defined.  As a result, you cannot check directly to see if the metadata adapter is “Wings::Valkyrie::MetadataAdapter”.  This check results in a “NameError”.  If we check for `disable_wings` first, then it avoids the check of the metadata adapter.

app/forms/hyrax/forms/resource_form.rb

@@ -53,16 +53,15 @@ class ResourceForm < Hyrax::ChangeSet # rubocop:disable Metrics/ClassLength
       #   we want to move away from application side lock validation and rely
       #   on the adapter/database features instead.
       LockKeyPopulator = lambda do |_options|
-        self.version =
-          case Hyrax.metadata_adapter
-          when Wings::Valkyrie::MetadataAdapter
+        if Hyrax.config.disable_wings || Hyrax.metadata_adapter != Wings::Valkyrie::MetadataAdapter
+          Hyrax.logger.info "trying to prepopulate a lock token for " \
+                            "#{self.class.inspect}, but optimistic locking isn't " \
+                            "supported for the configured adapter: #{Hyrax.metadata_adapter.class}"
+          self.version = ''
+        else
+          self.version =
             model.persisted? ? Wings::ActiveFedoraConverter.convert(resource: model).etag : ''
-          else
-            Hyrax.logger.info 'trying to prepopulate a lock token for ' \
-                              "#{self.class.inspect}, but optimistic locking isn't " \
-                              "supported for the configured adapter: #{Hyrax.metadata_adapter.class}"
-            ''
-          end
+        end
       end
 
       class_attribute :model_class

spec/forms/hyrax/forms/resource_form_spec.rb

@@ -384,7 +384,13 @@
     end
 
     context 'when using a generic valkyrie adapter', valkyrie_adapter: :test_adapter do
+      before do
+        allow(Hyrax).to receive_message_chain(:config, :disable_wings).and_return(true) # rubocop:disable RSpec/MessageChain
+        hide_const("Wings") # disable_wings=true removes the Wings constant
+      end
       it 'prepopulates as empty before save' do
+        expect(Hyrax.logger).to receive(:info)
+          .with(starting_with("trying to prepopulate a lock token for"))
         form.prepopulate!
         expect(form.version).to eq ''
       end
@@ -393,8 +399,9 @@
         let(:work) { FactoryBot.valkyrie_create(:hyrax_work) }
 
         it 'prepopulates empty' do
+          expect(Hyrax.logger).to receive(:info)
+            .with(starting_with("trying to prepopulate a lock token for"))
           form.prepopulate!
-
           expect(form.version).to eq ''
         end
       end