Mattermost project slash commands need better error reporting

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Description

Mattermost lets you create teams with arbitrary membership (i.e. team members don't all have to have access to a project)

But the gitlab slash commands are associated with a specific project.

So let's assume I create a new slash foo command for my project foo

Then I can do /foo issue show 1

If a non-member of project foo uses that command, the result is a generic message:

Proposal

Make Mattermost/Gitlab interaction error reporting more specific, at least for access/permission issues.

Links / references

gitlab-ce 8.14.1 omnibus