fix to handle viewing a data file with no content blob #2139

also test for edit

app/models/data_file.rb

@@ -119,7 +119,7 @@ def supports_spreadsheet_explore?
 
   def zipped_folder?
     return false if external_asset.is_a? OpenbisExternalAsset
-    content_blob.is_unzippable_datafile?
+    content_blob&.is_unzippable_datafile?
   end
 
   def matching_sample_type?

test/factories/data_files.rb

@@ -14,6 +14,13 @@
       end
     end
   end
+
+  factory(:data_file_with_no_content_blob, parent: :data_file) do
+    after(:create) do |data_file|
+      data_file.content_blob = nil
+      data_file.save!
+    end
+  end
 
   factory(:public_data_file, parent: :data_file) do
     policy { FactoryBot.create(:downloadable_public_policy) }

test/functional/data_files_controller_test.rb

@@ -4415,4 +4415,20 @@ def register_content_blob(skip_provide_metadata:false)
       assert flash[:error].include?('disabled')
     end
   end
+
+  test 'view data file with nil content blob' do
+    df = FactoryBot.create(:data_file_with_no_content_blob)
+    assert_nil df.content_blob
+    login_as(df.contributor)
+    get :show, params: { id: df }
+    assert_response :success
+  end
+
+  test 'edit data file with nil content blob' do
+    df = FactoryBot.create(:data_file_with_no_content_blob)
+    assert_nil df.content_blob
+    login_as(df.contributor)
+    get :edit, params: { id: df }
+    assert_response :success
+  end
 end