TT#31179 fix PATCH subscriberpreferences /lock

... when lock pref was not set before.

Change-Id: I5033b81759995e7fe059dc692c3d0cffa57960b7

lib/NGCP/Panel/Role/API/Preferences.pm

@@ -65,7 +65,9 @@ sub get_resource {
     my %profile_allowed_attrs; # for filtering subscriber attrs on its profile
     my $has_profile = 0;
     my $attr = 0;
+    my $resource = {};
     if($type eq "subscribers") {
+        $resource->{'lock'} = 0;
         $prefs = $item->provisioning_voip_subscriber->voip_usr_preferences;
         my $profile = $item->provisioning_voip_subscriber->voip_subscriber_profile;
         if ($profile) {
@@ -95,7 +97,6 @@ sub get_resource {
         order_by => { '-asc' => 'id' },
     });
 
-    my $resource;
     foreach my $pref($prefs->all) {
         my $value;
         my $processed = 0;