Do not generate tokens for editor IDs that do not exist

[ChristophWurst]

Fixes #18240

Untested as I have no clue how to use this :D

[juliusknorr]

Pushed another small commit to actually show the exception message.

[juliusknorr]

Steps to test:

1. Have the text app installed (master branch)
2. Create a file README.md
3. Call the api endpoint:

curl -X POST 'https://admin:admin@nextcloud.local/ocs/v2.php/apps/files/api/v1/directEditing/open?path=/README.md&editorId=NOTEXISTING&format=json' -H 'OCS-APIRequest: true'

[kesselb]

Pushed another small commit to actually show the exception message.

We are not leaking any information with that?

[tobiasKaminsky]

Pushed another small commit to actually show the exception message.

We are not leaking any information with that?

I doubt so. You can get the list of available editorIds via another endpoint.
Also this endpoint is only reachable when authenticated.

[kesselb]

I doubt so. You can get the list of available editorIds via another endpoint.
Also this endpoint is only reachable when authenticated.

Thanks 👍 I restarted the build.