[Bug]: Groups with gidNumber 0 are not shown when creating a new user

[calculoso]

Is there an existing issue for this?

• I have searched the existing issues

Environment

Verified on https://demo.phpldapadmin.org/
Also used environment from bug#484
- image: phpldapadmin/phpldapadmin:latest container
- LDAP Server: image: vegardit/openldap:latest container

PLA Code

Docker hub

PLA Version

docker phpldapadmin/phpldapadmin:latest (8f17a6415432)

Current Behavior

When creating a Generic: User Account when a posixGroup exists, there is a list of groups to assign to the user. This list does not include any groups that have a posix gidNumber of 0, presumably since phpldapadmin thinks a gidNumber of 0 is invalid.

Expected Behavior

Expected to list all groups, including those with gidNumber = 0.

Steps To Reproduce

1. Create the OU
2. Create the groups. LDIF as follows:
   version: 1
   dn: cn=adm,ou=groups,ou=t_ou_1,dc=example,dc=com
   cn: adm
   gidNumber: 0
   objectClass: posixGroup

version: 1
dn: cn=obs,ou=groups,ou=t_ou_1,dc=example,dc=com
cn: obs
gidNumber: 501
objectClass: posixGroup

version: 1
dn: cn=oper,ou=groups,ou=t_ou_1,dc=example,dc=com
cn: oper
gidNumber: 502
objectClass: posixGroup

4. Create the new user - Template: Generic: User Account
5. Observe that the above 'adm' group does not show up under the GID Number drop down.

Relevant log output

Anything else?

No response