non-critical error when creating LDAP user as local admin

[wiswedel]

Steps to reproduce

1. Login as local admin (database user)
2. Create an LDAP user --> user gets successfully created (however, successful user creation gets logged as error #3 applies)
3. see logs:

{"reqId":"NXaBb1IDP0LTAo8lpcH5","level":3,"time":"2019-06-28T09:16:09+00:00","remoteAddr":"192.168.56.1","user":"admin","app":"PHP","method":"POST","url":"/nextcloud/ocs/v2.php/cloud/users","message":"Uninitialized string offset: 0 at /var/www/html/nextcloud/apps/ldap_write_support/lib/LDAPUserManager.php#227","userAgent":"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:67.0) Gecko/20100101 Firefox/67.0","version":"16.0.1.1","id":"5d15dad9bdddd"}

[PHP] Error: Uninitialized string offset: 0 at /var/www/html/nextcloud/apps/ldap_write_support/lib/LDAPUserManager.php#227

POST /nextcloud/ocs/v2.php/cloud/users
from 192.168.56.1 by admin at 2019-06-28T09:16:09+00:00

Test setup

https://github.com/nextcloud/server/wiki/How-to-test-LDAP%3F

related code

https://github.com/nextcloud/ldap_write_support/blame/master/lib/LDAPUserManager.php#L227

[blizzz]

@wiswedel are you sure you have the patch applied properly?

Background: there is a server side fix that is included in the patch, for reference: nextcloud/server#16015

EDIT: that's was when the user base was not explicitly specified