labs: show a text that there are no active labs settings

rhodecode/templates/admin/settings/settings_labs.html

@@ -6,6 +6,9 b''
         ${h.secure_form(url('admin_settings_labs'), method='post')}
           <div class="form">
             <div class="fields">
+              % if not c.lab_settings:
+                ${_('There are no Labs settings currently')}
+              % else:
               % for lab_setting in c.lab_settings:
               <div class="field">
                 <div class="label">
@@ -45,6 +48,7 b''
                 ${h.submit('save', _('Save settings'), class_='btn')}
                 ${h.reset('reset', _('Reset'), class_='btn')}
               </div>
+              % endif
             </div>
           </div>
         ${h.end_form()}