Check to see if a group has ldap_access as null

src/main/java/org/gitlab/api/models/GitlabGroup.java

@@ -53,6 +53,7 @@ public class GitlabGroup {
     }
 
     public void setLdapAccess(GitlabAccessLevel ldapGitlabAccessLevel) {
+        if(ldapGitlabAccessLevel != null)//Check to see if a group has ldap_access as null
         this.ldapAccess = ldapGitlabAccessLevel.accessValue;
     }
 }