UX: Don't show empty user list for groups without members.

app/assets/javascripts/discourse/templates/components/group-members-input.hbs

@@ -1,14 +1,17 @@
 <label>{{i18n 'groups.members'}} ({{model.user_count}})</label>
-<div>
+
+{{#if model.members}}
+  <div>
     <a class="previous {{if showingFirst 'disabled'}}" {{action "previous"}}>{{fa-icon "fast-backward"}}</a>
     {{currentPage}}/{{totalPages}}
     <a class="next {{if showingLast 'disabled'}}" {{action "next"}}>{{fa-icon "fast-forward"}}</a>
-</div>
-<div class="ac-wrap clearfix">
+  </div>
+  <div class="ac-wrap clearfix">
     {{#each model.members as |member|}}
       {{group-member member=member automatic=model.automatic removeAction="removeMember"}}
     {{/each}}
-</div>
+  </div>
+{{/if}}
 
 {{#unless model.automatic}}
   <div class="group-members-input-selector">