Allow empty URLs in config values by default (#2253)

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

@@ -252,7 +252,7 @@ m[^(?:(?:\-+\s*BEGIN\s+(?:PUBLIC\s+KEY|CERTIFICATE)\s*\-+\r?\n)?[a-zA-Z0-9/\+\r\
             'form'    => 'text',
             'msgFail' => '__badUrl__',
             'test' =>
-qr/(?:(?:https?):\/\/(?:(?:(?:(?:(?:(?:[a-zA-Z0-9][-a-zA-Z0-9]*)?[a-zA-Z0-9])[.])*(?:[a-zA-Z][-a-zA-Z0-9]*[a-zA-Z0-9]|[a-zA-Z])[.]?)|(?:[0-9]+[.][0-9]+[.][0-9]+[.][0-9]+)))(?::(?:(?:[0-9]*)))?(?:\/(?:(?:(?:(?:(?:(?:[a-zA-Z0-9\-_.!~*'():@&=+\$,]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*)(?:;(?:(?:[a-zA-Z0-9\-_.!~*'():@&=+\$,]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*))*)(?:\/(?:(?:(?:[a-zA-Z0-9\-_.!~*'():@&=+\$,]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*)(?:;(?:(?:[a-zA-Z0-9\-_.!~*'():@&=+\$,]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*))*))*))(?:[?](?:(?:(?:[;\/?:@&=+\$,a-zA-Z0-9\-_.!~*'()]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*)))?))?)/
+qr/(?:^$|(?:(?:https?):\/\/(?:(?:(?:(?:(?:(?:[a-zA-Z0-9][-a-zA-Z0-9]*)?[a-zA-Z0-9])[.])*(?:[a-zA-Z][-a-zA-Z0-9]*[a-zA-Z0-9]|[a-zA-Z])[.]?)|(?:[0-9]+[.][0-9]+[.][0-9]+[.][0-9]+)))(?::(?:(?:[0-9]*)))?(?:\/(?:(?:(?:(?:(?:(?:[a-zA-Z0-9\-_.!~*'():@&=+\$,]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*)(?:;(?:(?:[a-zA-Z0-9\-_.!~*'():@&=+\$,]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*))*)(?:\/(?:(?:(?:[a-zA-Z0-9\-_.!~*'():@&=+\$,]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*)(?:;(?:(?:[a-zA-Z0-9\-_.!~*'():@&=+\$,]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*))*))*))(?:[?](?:(?:(?:[;\/?:@&=+\$,a-zA-Z0-9\-_.!~*'()]+|(?:%[a-fA-F0-9][a-fA-F0-9]))*)))?))?))/
         }
     };
 }

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

@@ -30,9 +30,11 @@ sub perlExpr {
     return $err ? ( -1, "__badExpression__: $err" ) : (1);
 }
 
-my $url = $RE{URI}{HTTP}{ -scheme => "https?" };
-$url =~ s/(?<=[^\\])\$/\\\$/g;
-$url = qr/$url/;
+my $url_re = $RE{URI}{HTTP}{ -scheme => "https?" };
+$url_re =~ s/(?<=[^\\])\$/\\\$/g;
+my $url = qr/$url_re/;
+my $urlOrEmpty = qr/(?:^$|$url_re)/;
+
 
 sub types {
     return {
@@ -51,7 +53,7 @@ sub types {
         },
         url => {
             form    => 'text',
-            test    => $url,
+            test    => $urlOrEmpty,
             msgFail => '__badUrl__',
         },
         PerlModule => {