unlink(cloud/themes/example/core/templates/lostpassword/email.php): No such file or directory at /cloud/apps/templateeditor/lib/mailtemplate.php#127

[Dennis1993]

Steps to reproduce

1. Select a mail template in admin-panel
2. select in the left menu "example" and in the right any template
3. now click on "reset" (Zurücksetzen in German)

Expected behaviour

Tell us what should happen
the button should not displayed, because I've no template to reset (thats the default one)

Actual behaviour

Tell us what happens instead
error message in log

Server configuration

Operating system:
Ubuntu

Web server:
Apache 2.4

Database:
MySQL 5.6.

PHP version:
7.0.8

Nextcloud version: (see Nextcloud admin page)
9.0.53 (stable)

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

Where did you install Nextcloud from:
nextcloud.com

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 
nothing

List of activated apps:

Default apps with calendar app

The content of config/config.php:

Default, no changes

Are you using external storage, if yes which one: local/smb/sftp/...
no

Are you using encryption: yes/no
no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...
no

Client configuration

Browser:
IE11 and Microsoft Edge

Operating system:
Windows 10

Nextcloud log (data/nextcloud.log)

Nextcloud log

unlink(/cloud/themes/example/core/templates/lostpassword/email.php): No such file or directory at /cloud/apps/templateeditor/lib/mailtemplate.php#127 

[MorrisJobke]

Fix is in nextcloud/templateeditor#10