Command files:checksums:verify should inform that it is not prepared to work with encryption instead of fail.

[SergioBertolinSG]

Steps to reproduce

0. Having a server with encryption enabled.
1. Run files:checksums:verify command.

Expected behavior

Inform the admin user running the command that this command is not available when encryption is enabled.

Actual behavior

It tries to run, but it fails because the command is not prepared to run with encryption.

Server configuration

Operating system:
Ubuntu 16.04

Web server:
Apache

Database:
MySQL

PHP version:
7.1

Cache
DB

ownCloud version: (see ownCloud admin page)
{"installed":true,"maintenance":false,"needsDbUpgrade":false,"version":"10.0.8.1","versionstring":"10.0.8 RC1","edition":"Enterprise","productname":"ownCloud"}

Updated from an older ownCloud or fresh install:
Fresh

The content of config/config.php:

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

Are you using encryption:
Yes.

Logs

{"reqId":"Ugypt0xyy66gMfI4Bvoj","level":3,"time":"2018-04-16T10:32:33+00:00","remoteAddr":"","user":"--","app":"no app in context","method":"--","url":"--","message":"Can not decrypt this file, probably this is a shared file. Please ask the file owner to reshare the file with you."}

Client configuration

Browser
Chrome.

cc @IljaN @pmaier1

[ownclouders]

GitMate.io thinks possibly related issues are #3964 (Encryption works only with uploaded files), #12685 (Versioning not working with Encryption), #23786 (files:transfer-ownership command does not work in some scenarios with encryption), #31008 ([stable10] Verify checksums command), and #29081 (decrypt-all command fails to decrypt files when user specific key is enabled in the encryption).

[pmaier1]

Good finding. Considered as nice-to-have from my POV.

[PVince81]

moving to 10.0.9

[binarykitchen]

Having the same problem here and it's a pain.