Config parser: fail if a "select"-type option does not contain a scalar

lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Attributes.pm

@@ -224,6 +224,7 @@ m[^(?:(?:\-+\s*BEGIN\s+(?:PUBLIC\s+KEY|CERTIFICATE)\s*\-+\r?\n)?[a-zA-Z0-9/\+\r\
         },
         'select' => {
             'test' => sub {
+                return 0, 'Value is not a scalar' if ref $_[0];
                 my $test = grep( { $_ eq $_[0]; }
                     map( { $_->{'k'}; } @{ $_[2]{'select'}; } ) );
                 return $test

lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Build/Attributes.pm

@@ -116,6 +116,7 @@ sub types {
         },
         select => {
             test => sub {
+                return ( 0, "Value is not a scalar" ) if ref( $_[0] );
                 my $test = grep ( { $_ eq $_[0] }
                     map ( { $_->{k} } @{ $_[2]->{select} } ) );
                 return $test