Follow up: Fixed issue #519 - Import of articles without a content type fails.

lib/import/otrs/article.rb

@@ -36,8 +36,7 @@ module Import
       def import(article)
         create_or_update(map(article))
 
-        return if !article['Attachments']
-        return if article['Attachments'].empty?
+        return if article['Attachments'].blank?
 
         Import::OTRS::Article::AttachmentFactory.import(
           attachments:   article['Attachments'],
@@ -69,6 +68,14 @@ module Import
       end
 
       def map(article)
+        mapped = map_default(article)
+        # if no content type is set make sure to remove it
+        # so Zammad can set the default content type
+        mapped.delete(:content_type) if mapped[:content_type].blank?
+        mapped
+      end
+
+      def map_default(article)
         {
           created_by_id: 1,
           updated_by_id: 1,

spec/import/otrs/article_spec.rb

@@ -60,4 +60,38 @@ RSpec.describe Import::OTRS::Article do
       updates_with(zammad_structure)
     end
   end
+
+  context 'no content type' do
+
+    let(:object_structure) { load_article_json('no_content_type') }
+    let(:zammad_structure) {
+      {
+        created_by_id: '1',
+        updated_by_id: 1,
+        ticket_id: '999',
+        id: '999',
+        body: "Welcome!\n\nThank you for installing OTRS.\n\nYou will find updates and patches at http://www.otrs.com/open-source/.\nOnline documentation is available at http://doc.otrs.org/.\nYou can also use our mailing lists http://lists.otrs.org/\nor our forums at http://forums.otrs.org/\n\nRegards,\n\nThe OTRS Project\n",
+        from: 'OTRS Feedback <feedback@otrs.org>',
+        to: 'Your OTRS System <otrs@localhost>',
+        cc: nil,
+        subject: 'Welcome to OTRS!',
+        in_reply_to: nil,
+        message_id: '<007@localhost>',
+        references: nil,
+        updated_at: '2014-06-24 09:32:14',
+        created_at: '2010-08-02 14:00:00',
+        type_id: 1,
+        internal: false,
+        sender_id: 2
+      }
+    }
+
+    it 'creates' do
+      creates_with(zammad_structure)
+    end
+
+    it 'updates' do
+      updates_with(zammad_structure)
+    end
+  end
 end