Merge branch 'ent-6129-9761-macros-en-alertas-de-correlacion-de-eventos-no-funcionan' into 'develop'

minor fix - error messages

See merge request artica/pandorafms!3440

pandora_server/lib/PandoraFMS/DB.pm

@@ -1365,6 +1365,8 @@ sub db_concat ($$) {
 ########################################################################
 sub get_priority_name ($) {
 	my ($priority_id) = @_;
+
+	return '' unless defined($priority_id);
 	
 	if ($priority_id == 0) {
 		return 'Maintenance';