Add no data message when no zone rendering is ready, #5983

Author: helmo

interface/web/dns/lib/lang/en_dns_soa.lng

@@ -43,4 +43,5 @@ $wb['soa_cannot_be_changed_txt'] = 'The Zone (SOA) can not be changed. Please co
 $wb['configuration_error_txt'] = 'CONFIGURATION ERROR';
 $wb['dnssec_algo_txt'] = 'DNSSEC Algorithm';
 $wb['rendered_zone_txt'] = 'Bind zone format for reference and export.';
+$wb['rendered_zone_unavailable_txt'] = 'Sorry, no data is available yet.';
 ?>

interface/web/dns/templates/dns_soa_rendered.htm

@@ -1,8 +1,10 @@
 
-{tmpl_var name='rendered_zone_txt'}
-<pre>
-{tmpl_var name='rendered_zone'}
-</pre>
+{tmpl_if name='rendered_zone'}
+    {tmpl_var name='rendered_zone_txt'}
+    <pre>{tmpl_var name='rendered_zone'}</pre>
+{tmpl_else}
+    {tmpl_var name='rendered_zone_unavailable_txt'}
+{/tmpl_if}
 
 <div class="pnl_formsarea">
     <input type="hidden" name="id" value="{tmpl_var name='id'}">