MapStore2
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The save dashboard message is displayed twice
Description
Sometime the Save warning message appears twice if the user saves a dashboard.

How to reproduce
- Login as admin
- Open a dashboard
- Click on Options > Save
- Click on Save
Current Result
The Save message appears twice
- [x] Not browser related
Browser info
(use this site: https://www.whatsmybrowser.org/ for non expert users)| Browser Affected | Version |
|---|---|
| Internet Explorer | |
| Edge | |
| Chrome | |
| Firefox | |
| Safari |
Other useful information
It seems a regression introduced after #8457. The tool works well in QA.