missing entry of email address in oc_users table

[mr-bolle]

Steps to reproduce

1. Admin Account > Setting > activate 'Show email address'
2. into User Management a new Column 'E-Mail' exist
3. Add a new User or adjust a existing User with the E-Mail Address
4. SQL Request: select * from oc_users - only 'uid' 'displayname' 'password' is available

https://abload.de/img/adminaccount-user-setlns1h.jpg

Expected behaviour

Into the oc_users Table the E-Mail Address from the Users should be available

Actual behaviour

The User Account E-Mail Address is missing into the SQL Table. And that's why it isn't possible to create a Backup of this Information.

Server configuration

Operating system:
Rasbian Debian Jessie - Linux 4.4.38-v7+ on armv7l

Web server:
Apache2

Database:
MariaDB

PHP version:
PHP 5.6.29-0+deb8u1

Nextcloud version: (see Nextcloud admin page)
10.0.3 (stable) - the same behavior i recognize from the previous versions

Updated from an older Nextcloud/ownCloud or fresh install:
update from a older install

Where did you install Nextcloud from:
https://download.nextcloud.com/server/releases/

Signing status:

Signing status

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

List of activated apps:

App list

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

The content of config/config.php:

Config report

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or 

Insert your config.php content here
(Without the database password, passwordsalt and secret)

Are you using external storage, if yes which one: local/smb/sftp/...

Are you using encryption: yes/no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

LDAP configuration (delete this part if not used)

LDAP config

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your Nextcloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';


Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser:

Operating system:

Logs

Web server error log

Web server error log

``` Insert your webserver log here ```

Nextcloud log (data/nextcloud.log)

Nextcloud log

``` Insert your Nextcloud log here ```

Browser log

Browser log

``` Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

</details>

[blizzz]

The email is stored in the oc_preferences table.