refactor(frontend): improved description on client viewer

lib/Ravada/Front.pm

@@ -338,7 +338,7 @@ sub list_domains($self, %args) {
             $row->{node} = $domain->_vm->name if $domain->_vm;
             $row->{remote_ip} = $domain->client_status
                 if $domain->client_status && $domain->client_status !~ /^connected/;
-            if  ( $domain->client_status && $domain->client_status =~ /^connected \((.*?)\)/ ) {
+            if  ($domain->remote_ip && $domain->client_status && $domain->client_status =~ /^connected \((.*?)\)/ ) {
                 $row->{remote_ip} = $domain->remote_ip.".$1";
             }
             $row->{autostart} = $domain->_data('autostart');