Gallery does not find any media files

[trupf]

Bug report

Steps to reproduce

1. upgrade to debian version owncloud-files 9.1.3-1.1
2. log in and go to main to files app
3. load any .jpg image to the folder (actually it can be any folder)
4. switch to gallery view

Expected behaviour

image should be shown in gallery.

Actual behaviour

showing icon + "No media files found"

Further if I click on an picture file in the file app. it should be shown in the full browser window. Instead a download of the file is offered. This was working in version 7.0.

Server configuration

Operating system: Debian 8.6 on armv5

Web server: nginx/1.10.2

Database: mysql Ver 14.14 Distrib 5.6.30

PHP version: php 7.0

cloud server: Nextcloud or ownCloud ownCloud 9.1.3

cloud version: (see admin page or version.php) ownCloud 9.1.3 stable

Updated from an older installation or fresh install: updated from Debian release 7.0 as described here: https://owncloud.org/blog/upgrading-owncloud-on-debian-stable-to-official-packages/

List of activated apps:

App list

Enabled: - activity: 2.3.2 - calendar: 1.4.1 - comments: 0.3.0 - contacts: 1.5.1 - dav: 0.2.7 - federatedfilesharing: 0.3.0 - federation: 0.1.0 - files: 1.5.1 - files_external: 0.6.0 - files_sharing: 0.10.0 - files_texteditor: 2.1 - files_trashbin: 0.9.0 - files_versions: 1.3.0 - files_videoviewerplus: 0.2.0 - gallery: 15.0.1 - notifications: 0.3.0 - provisioning_api: 0.5.0 - systemtags: 0.3.0 - tasks: 0.9.4 - templateeditor: 0.1 - updatenotification: 0.2.1 Disabled: - audioplayer - encryption - external - files_antivirus - files_pdfviewer - files_videoplayer - firstrunwizard - user_external - user_ldap

The content of config/config.php:

Config report

{ "system": { "instanceid": "oc85ae6e4789", "passwordsalt": "***REMOVED SENSITIVE VALUE***", "secret": "***REMOVED SENSITIVE VALUE***", "trusted_domains": [ "trhome.my-router.de", "nas.tr-home.de", "nas", "localhost" ], "datadirectory": "\/var\/ocdata", "overwritewebroot": "\/owncloud", "overwrite.cli.url": "\/owncloud", "dbtype": "mysql", "dbname": "owncloud", "dbhost": "127.0.0.1", "dbuser": "***REMOVED SENSITIVE VALUE***", "dbpassword": "***REMOVED SENSITIVE VALUE***", "version": "9.1.3.1", "appstoreenabled": true, "appstore.experimental.enabled": true, "appstoreurl": "https:\/\/api.owncloud.com\/v1", "apps_paths": [ { "path": "\/var\/www\/owncloud\/apps", "url": "\/apps", "writable": true } ], "enable_previews": false, "enable_avatars": true, "preview_max_x": 100, "preview_max_y": 100, "memcache.local": "\\OC\\Memcache\\Redis", "memcache.locking": "\\OC\\Memcache\\Redis", "redis": { "host": "\/var\/run\/redis\/redis.sock", "port": 0, "timeout": 0 }, "installed": true, "default_language": "de", "mail_domain": "nas.tr-home.de", "mail_smtpmode": "sendmail", "mail_from_address": "trowncloud", "trashbin_retention_obligation": "auto,60, auto", "version_retention_obligation": "auto,30", "syslog_tag": "ownCloud", "loglevel": 0, "logfile": "\/tmp\/var\/log\/nginx\/owncloud.log", "forcessl": true, "maintenance": false, "asset-pipeline.enabled": true, "quota_include_external_storage": false, "theme": "", "updatechecker": false } }

Are you using external storage, if yes which one: local folder, smb share, sftp, etc. local folder

Are you using encryption: yes/no no

Are you using custom gallery.cnf config files: yes/no yes and no (I tried both ways)

Web server error log

Web server error log

``` nothing related shown here ```

Cloud log

Cloud log

``` nothing related shown here ```

Client configuration

Browser: Firefox 45.0.2 (but same thing with Chromium)

Operating system: Debian stretch

Browser log

Browser log

I see only warnings here like this one:
SyntaxError: test for equality (==) mistyped as assignment (=)? 3a97a8fea75449dd557eb82402c291d7.js:2:7647