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DOCS - Repeating panels require variable to have one or more items (#23080)

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* add note that it's not supported to repeat a panel zero times
see https://github.com/grafana/grafana/issues/23036#issuecomment-603479142

Signed-off-by: David Ellis <ellisda@gmail.com>

* Update docs/sources/reference/templating.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
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docs/sources/reference/templating.md
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@ -407,6 +407,8 @@ By choosing `vertical` the panels will be arranged from top to bottom in a colum
Only make changes to the first panel (the original template). To have the changes take effect on all panels you need to trigger a dynamic dashboard re-build. Only make changes to the first panel (the original template). To have the changes take effect on all panels you need to trigger a dynamic dashboard re-build.
You can do this by either changing the variable value (that is the basis for the repeat) or reload the dashboard. You can do this by either changing the variable value (that is the basis for the repeat) or reload the dashboard.
> **Note:** Repeating panels require variables to have one or more items selected; you cannot repeat a panel zero times to hide it.
## Repeating Rows ## Repeating Rows
As seen above with the *Panels* you can also repeat *Rows* if you have variables set with `Multi-value` or As seen above with the *Panels* you can also repeat *Rows* if you have variables set with `Multi-value` or