Merge branch '6145-extract-app-views-shared-issuable-3-ee' into 'master'

Resolve 3 "Extract EE specific files/lines for app/views/shared/issuable"

See merge request gitlab-org/gitlab-ee!6121

app/views/shared/issuable/form/_metadata.html.haml

@@ -27,7 +27,7 @@
         .issuable-form-select-holder
           = render "shared/issuable/label_dropdown", classes: ["js-issuable-form-dropdown"], selected: issuable.labels, data_options: { field_name: "#{issuable.class.model_name.param_key}[label_ids][]", show_any: false }, dropdown_title: "Select label"
 
-    = render "shared/issuable/form/weight", issuable: issuable, form: form
+    = render_if_exists "shared/issuable/form/weight", issuable: issuable, form: form
 
   - if has_due_date
     .col-lg-6