Metadata request with missing ldap user fail

[jewzaam]

The lookup to ldap fails and the user cannot do requests. We'd like clients with a valid cert to do read operations against metadata at least. Here's the important bits of the stack traces:

2016-04-13 09:52:24,175 [https_executor-threads - 162] ERROR [com.redhat.lightblue.rest.auth.ldap.LightblueLdapRoleProvider] No result found roles for user: lb-miwhite: com.redhat.lightblue.rest.auth.ldap.LDAPUserNotFoundException
        at com.redhat.lightblue.rest.auth.ldap.LDAPSearcher.searchLDAPServer(LDAPSearcher.java:54)
        at com.redhat.lightblue.rest.auth.ldap.CachedLdapFindUserRolesByUidCommand.run(CachedLdapFindUserRolesByUidCommand.java:76)
        at com.redhat.lightblue.rest.auth.ldap.CachedLdapFindUserRolesByUidCommand.run(CachedLdapFindUserRolesByUidCommand.java:29)

2016-04-13 09:52:24,177 [https_executor-threads - 162] ERROR [com.redhat.lightblue.rest.auth.jboss.CertLdapLoginModule] Failed to assign principal [null] to role [authenticated]: java.lang.NullPointerException
        at java.util.ArrayList.addAll(ArrayList.java:577)
        at com.redhat.lightblue.rest.auth.ldap.LightblueLdapRoleProvider.getUserRoles(LightblueLdapRoleProvider.java:60)
        at com.redhat.lightblue.rest.auth.ldap.LightblueLdapRoleProvider.getUserRoles(LightblueLdapRoleProvider.java:41)
        at com.redhat.lightblue.rest.auth.jboss.CertLdapLoginModule.getRoleSets(CertLdapLoginModule.java:118)