Fix is_empty tests

lib/Pear/LocalLoop/Controller/Api/Feedback.pm

@@ -34,7 +34,7 @@ sub post_feedback {
   my $user_rs = $c->schema->resultset('User');
 
   $validation->required('email')->in_resultset( 'email', $user_rs );
-  $validation->required('feedbacktext');
+  $validation->required('feedbacktext', 'not_empty');
   $validation->required('app_name');
   $validation->required('package_name');
   $validation->required('version_code');

lib/Pear/LocalLoop/Controller/Api/Register.pm

@@ -69,8 +69,8 @@ sub post_register {
   my $usertype = $validation->param('usertype') || '';
 
   if ( $usertype eq 'customer' ) {
-    $validation->required('display_name');
+    $validation->required('display_name', 'not_empty');
-    $validation->required('full_name');
+    $validation->required('full_name', 'not_empty');
     my $year = DateTime->now->year;
     $validation->required('year_of_birth')->number->gt_num($year - 150)->lt_num($year - 10);
   } elsif ( $usertype eq 'organisation' ) {