Remove EE-specific code from new MR email

app/views/notify/new_merge_request_email.html.haml

@@ -9,9 +9,7 @@
   %p
     Assignee: #{@merge_request.assignee_name}
 
-- if @merge_request.approvers.any?
-  %p
-    Approvers: #{render_items_list(@merge_request.approvers_left.map(&:name))}
+= render_if_exists 'notify/merge_request_approvers', merge_request: @merge_request
 
 - if @merge_request.description
   %div

app/views/notify/new_merge_request_email.text.erb

@@ -5,9 +5,6 @@ New Merge Request <%= @merge_request.to_reference %>
 <%= merge_path_description(@merge_request, 'to') %>
 Author:    <%= @merge_request.author_name %>
 Assignee:  <%= @merge_request.assignee_name %>
-<% if @merge_request.approvers.any? %>
-Approvers: <%= render_items_list(@merge_request.approvers_left.map(&:name)) %>
-<% end %>
+<%= render_if_exists 'notify/merge_request_approvers', merge_request: @merge_request %>
 
 <%= @merge_request.description %>
-

ee/app/views/notify/_merge_request_approvers.html.haml

+- merge_request = local_assigns.fetch(:merge_request)
+- return unless merge_request.approvers.any?
+
+%p
+  Approvers: #{render_items_list(merge_request.approvers_left.map(&:name))}

ee/app/views/notify/_merge_request_approvers.text.erb

+<%- merge_request = local_assigns.fetch(:merge_request) -%>
+<%- return unless merge_request.approvers.any? -%>
+Approvers: <%= render_items_list(merge_request.approvers_left.map(&:name)) %>