bugfix: $controls MUST not be NULL when calling ldap_search() #4796
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otherwise a TypeError Exception is raised:
TypeError thrown with message "ldap_search() expects parameter 9 to be array, null given"
Stacktrace:
#10 TypeError in /.../Services/LDAP/classes/class.ilLDAPQuery.php:520
#9 ldap_search in /.../Services/LDAP/classes/class.ilLDAPQuery.php:520
#8 ilLDAPQuery:queryByScope in /.../Services/LDAP/classes/class.ilLDAPQuery.php:474
#7 ilLDAPQuery:readUserData in /.../Services/LDAP/classes/class.ilLDAPQuery.php:87
#6 ilLDAPQuery:fetchUser in /.../Services/LDAP/classes/class.ilAuthProviderLDAP.php:58