refactor: installation problem and undefined warning

lib/Ravada.pm

@@ -4539,7 +4539,7 @@ sub _enforce_limits_active($self, $request) {
     for my $id_user(keys %domains) {
         my $user = Ravada::Auth::SQL->search_by_id($id_user);
         my %grants = $user->grants();
-        my $start_limit = ((exists($grants{'start_limit'})) && ($grants{'start_limit'} > 0)) ? $grants{'start_limit'} : $start_limit_default;
+        my $start_limit = (defined($grants{'start_limit'}) && $grants{'start_limit'} > 0) ? $grants{'start_limit'} : $start_limit_default;
 
         next if scalar @{$domains{$id_user}} <= $start_limit;
         next if $user->is_admin;

sql/mysql/grant_types.sql

@@ -3,6 +3,7 @@ CREATE TABLE `grant_types` (
   `name` char(32) NOT NULL,
   `description` varchar(255) NOT NULL,
   `enabled` int default NULL,
+  `is_int` int default 0,
     UNIQUE(`name`),
     UNIQUE(`description`),
   PRIMARY KEY (`id`)

sql/sqlite/grant_types.sql

@@ -3,5 +3,6 @@ CREATE TABLE `grant_types` (
 ,  `name` char(32) NOT NULL
 ,  `description` varchar(255) NOT NULL
 ,  `enabled` integer default NULL
+,  `is_int` integer default 0
 ,    UNIQUE(`name`)
 );