Only show text wrap and diff notes for text in MR.

app/views/projects/diffs/_file.html.haml

@@ -15,12 +15,13 @@
         %span.file-mode= "#{diff_file.diff.a_mode} → #{diff_file.diff.b_mode}"
 
       .diff-btn-group
+        - if blob.text?
           - unless params[:view] == 'parallel'
             %label
-            = check_box_tag nil, 1, false, class: "js-toggle-diff-line-wrap"
+              = check_box_tag nil, 1, false, class: 'js-toggle-diff-line-wrap'
               Wrap text
            
-        = link_to "#", class: "js-toggle-diff-comments btn btn-small" do
+          = link_to '#', class: 'js-toggle-diff-comments btn btn-small' do
             %i.icon-chevron-down
             Diff comments