Removed JS update templates

app/controllers/projects/issues_controller.rb

@@ -100,7 +100,6 @@ class Projects::IssuesController < Projects::ApplicationController
     end
 
     respond_to do |format|
-      format.js
       format.html do
         if @issue.valid?
           redirect_to issue_path(@issue)

app/controllers/projects/merge_requests_controller.rb

@@ -148,7 +148,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
 
     if @merge_request.valid?
       respond_to do |format|
-        format.js
         format.html do
           redirect_to([@merge_request.target_project.namespace.becomes(Namespace),
                        @merge_request.target_project, @merge_request])

app/views/shared/issuable/_sidebar.html.haml

@@ -20,7 +20,7 @@
           %a.btn.btn-default.disabled{href: '#'}
             Next
 
-    = form_for [@project.namespace.becomes(Namespace), @project, issuable], remote: true, html: {class: 'issuable-context-form inline-update js-issuable-update'} do |f|
+    = form_for [@project.namespace.becomes(Namespace), @project, issuable], remote: true, format: :json, html: {class: 'issuable-context-form inline-update js-issuable-update'} do |f|
       .block.assignee
         .sidebar-collapsed-icon.sidebar-collapsed-user{data: {toggle: "tooltip", placement: "left", container: "body"}, title: (issuable.assignee.to_reference if issuable.assignee)}
           - if issuable.assignee