Show answers with attachments in additional info

We weren't showing the details of answers without a description, even if
they had images, videos or documents. Some users found that behavior
unexpected since the description isn't a mandatory field and so they
left it blank, but they added images to that answer and they didn't
appear on the poll page.

Note we had a condition not to show the title of an answer when it had
no description. I think that condition was redundant because answers
without a description weren't loaded in the first place. Anyway, that
condition doesn't make sense anymore because we're displaying answers
with images but no description.

spec/models/poll/question/answer_spec.rb

@@ -2,4 +2,36 @@ require "rails_helper"
 
 describe Poll::Question::Answer do
   it_behaves_like "globalizable", :poll_question_answer
+
+  describe "#with_content" do
+    it "returns answers with a description" do
+      answer = create(:poll_question_answer, description: "I've got a description")
+
+      expect(Poll::Question::Answer.with_content).to eq [answer]
+    end
+
+    it "returns answers with images and no description" do
+      answer = create(:poll_question_answer, :with_image, description: "")
+
+      expect(Poll::Question::Answer.with_content).to eq [answer]
+    end
+
+    it "returns answers with documents and no description" do
+      question = create(:poll_question_answer, :with_document, description: "")
+
+      expect(Poll::Question::Answer.with_content).to eq [question]
+    end
+
+    it "returns answers with videos and no description" do
+      question = create(:poll_question_answer, :with_video, description: "")
+
+      expect(Poll::Question::Answer.with_content).to eq [question]
+    end
+
+    it "does not return answers with no description and no images, documents nor videos" do
+      create(:poll_question_answer, description: "")
+
+      expect(Poll::Question::Answer.with_content).to be_empty
+    end
+  end
 end