Stub fragment for empty dashboards.

[arazabishov]

Implement fragment with meaningful message for empty dashboard.

[stale]

Hi! Due to a lack of activity on this issue over time (7.776*10^9 ms and counting, to be precise) it seems to be stale. If there is no further progress on it, it will be closed automatically.

If this is still relevant, maybe there is something you can do to move it forward? For example provide further information in a comment, or supply a PR? Any activity on this issue will keep it open. Thanks! 🤖