When the user exports the note records, an error is raised because the
'__count' key does not exist in the result of the 'read_group' method.
Steps to reproduce:
------------------
- Go to the Notes
- Click on the list view of notes and filter group by Stage.
- Click on the export all button to print the excel report and see the
error.
Expected behavior:
-----------------
The data should be exported in `csv` file.
Current behavior:
----------------
An error is raised when the user wants to export the data.
closesodoo/odoo#108394
X-original-commit: 3bd979421744a11b6f10c95f47cf378720079ffb
Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>