Unify errors on reply comments specs

Note that the click_link "Reply" is now inside a "within".

This is due to the case of "legislation_annotation" before in the original test
no comment was created as it simply took the one created by default when creating
a "legislation_annotation".

```
comment = annotation.comments.first
```

Now to try to unify this test, we always create a comment, and in this case as we
also created the "legislation_annotation" we have 2 comments, so it is necessary
to add the "click_link" inside the "within".

spec/system/comments/budget_investments_spec.rb

@@ -1,25 +1,10 @@
 require "rails_helper"
 
 describe "Commenting Budget::Investments" do
-  let(:user) { create(:user) }
   let(:investment) { create(:budget_investment) }
 
   it_behaves_like "flaggable", :budget_investment_comment
 
-  scenario "Errors on reply" do
-    comment = create(:comment, commentable: investment, user: user)
-
-    login_as(user)
-    visit budget_investment_path(investment.budget, investment)
-
-    click_link "Reply"
-
-    within "#js-comment-form-comment_#{comment.id}" do
-      click_button "Publish reply"
-      expect(page).to have_content "Can't be blank"
-    end
-  end
-
   scenario "N replies" do
     parent = create(:comment, commentable: investment)
 

spec/system/comments/debates_spec.rb

@@ -112,20 +112,6 @@ describe "Commenting debates" do
     end
   end
 
-  scenario "Errors on reply" do
-    comment = create(:comment, commentable: debate, user: user)
-
-    login_as(user)
-    visit debate_path(debate)
-
-    click_link "Reply"
-
-    within "#js-comment-form-comment_#{comment.id}" do
-      click_button "Publish reply"
-      expect(page).to have_content "Can't be blank"
-    end
-  end
-
   scenario "N replies" do
     parent = create(:comment, commentable: debate)
 

spec/system/comments/legislation_annotations_spec.rb

@@ -6,20 +6,6 @@ describe "Commenting legislation questions" do
 
   it_behaves_like "flaggable", :legislation_annotation_comment
 
-  scenario "Errors on reply" do
-    comment = annotation.comments.first
-
-    login_as(user)
-    visit polymorphic_path(annotation)
-
-    click_link "Reply"
-
-    within "#js-comment-form-comment_#{comment.id}" do
-      click_button "Publish reply"
-      expect(page).to have_content "Can't be blank"
-    end
-  end
-
   scenario "N replies" do
     parent = create(:comment, commentable: annotation)
 

spec/system/comments/legislation_questions_spec.rb

@@ -10,20 +10,6 @@ describe "Commenting legislation questions" do
     it_behaves_like "flaggable", :legislation_question_comment
   end
 
-  scenario "Errors on reply" do
-    comment = create(:comment, commentable: question, user: user)
-
-    login_as(user)
-    visit legislation_process_question_path(question.process, question)
-
-    click_link "Reply"
-
-    within "#js-comment-form-comment_#{comment.id}" do
-      click_button "Publish reply"
-      expect(page).to have_content "Can't be blank"
-    end
-  end
-
   scenario "N replies" do
     parent = create(:comment, commentable: question)
 

spec/system/comments/polls_spec.rb

@@ -4,20 +4,6 @@ describe "Commenting polls" do
   let(:user) { create(:user) }
   let(:poll) { create(:poll, author: create(:user)) }
 
-  scenario "Errors on reply" do
-    comment = create(:comment, commentable: poll, user: user)
-
-    login_as(user)
-    visit poll_path(poll)
-
-    click_link "Reply"
-
-    within "#js-comment-form-comment_#{comment.id}" do
-      click_button "Publish reply"
-      expect(page).to have_content "Can't be blank"
-    end
-  end
-
   scenario "N replies" do
     parent = create(:comment, commentable: poll)
 

spec/system/comments/proposals_spec.rb

@@ -1,25 +1,10 @@
 require "rails_helper"
 
 describe "Commenting proposals" do
-  let(:user) { create(:user) }
   let(:proposal) { create(:proposal) }
 
   it_behaves_like "flaggable", :proposal_comment
 
-  scenario "Errors on reply" do
-    comment = create(:comment, commentable: proposal, user: user)
-
-    login_as(user)
-    visit proposal_path(proposal)
-
-    click_link "Reply"
-
-    within "#js-comment-form-comment_#{comment.id}" do
-      click_button "Publish reply"
-      expect(page).to have_content "Can't be blank"
-    end
-  end
-
   scenario "N replies" do
     parent = create(:comment, commentable: proposal)
 

spec/system/comments/topics_spec.rb

@@ -1,27 +1,10 @@
 require "rails_helper"
 
 describe "Commenting topics from proposals" do
-  let(:user)     { create(:user) }
   let(:proposal) { create(:proposal) }
 
   it_behaves_like "flaggable", :topic_with_community_comment
 
-  scenario "Errors on reply" do
-    community = proposal.community
-    topic = create(:topic, community: community)
-    comment = create(:comment, commentable: topic, user: user)
-
-    login_as(user)
-    visit community_topic_path(community, topic)
-
-    click_link "Reply"
-
-    within "#js-comment-form-comment_#{comment.id}" do
-      click_button "Publish reply"
-      expect(page).to have_content "Can't be blank"
-    end
-  end
-
   scenario "N replies" do
     community = proposal.community
     topic = create(:topic, community: community)
@@ -274,22 +257,6 @@ describe "Commenting topics from budget investments" do
   let(:user)       { create(:user) }
   let(:investment) { create(:budget_investment) }
 
-  scenario "Errors on reply" do
-    community = investment.community
-    topic = create(:topic, community: community)
-    comment = create(:comment, commentable: topic, user: user)
-
-    login_as(user)
-    visit community_topic_path(community, topic)
-
-    click_link "Reply"
-
-    within "#js-comment-form-comment_#{comment.id}" do
-      click_button "Publish reply"
-      expect(page).to have_content "Can't be blank"
-    end
-  end
-
   scenario "N replies" do
     community = investment.community
     topic = create(:topic, community: community)

spec/system/comments_spec.rb

@@ -361,6 +361,22 @@ describe "Comments" do
     end
   end
 
+  scenario "Errors on reply" do
+    comment = create(:comment, commentable: resource, user: user)
+
+    login_as(user)
+    visit polymorphic_path(resource)
+
+    within "#comment_#{comment.id}" do
+      click_link "Reply"
+    end
+
+    within "#js-comment-form-comment_#{comment.id}" do
+      click_button "Publish reply"
+      expect(page).to have_content "Can't be blank"
+    end
+  end
+
   scenario "Errors on create" do
     login_as(user)
     visit polymorphic_path(resource)