Disallow revision edits with empty raw content

lib/post_revisor.rb

@@ -121,6 +121,8 @@ class PostRevisor
 
     @topic_changes = TopicChanges.new(@topic, editor)
 
+    return false if @fields.has_key?(:raw) && @fields[:raw].blank?
+
     # some normalization
     @fields[:raw] = cleanup_whitespaces(@fields[:raw]) if @fields.has_key?(:raw)
     @fields[:user_id] = @fields[:user_id].to_i if @fields.has_key?(:user_id)

spec/components/post_revisor_spec.rb

@@ -114,6 +114,15 @@ describe PostRevisor do
       end
     end
 
+    describe 'with nil raw contents' do
+      it "doesn't change version" do
+        expect {
+          expect(subject.revise!(post.user, raw: nil)).to eq(false)
+          post.reload
+        }.not_to change(post, :version)
+      end
+    end
+
     describe 'ninja editing' do
       it 'correctly applies edits' do
         SiteSetting.editing_grace_period = 1.minute