ods_style: do not export an empty sheet for empty report header
In `sheet_per_report_section` mode if the report do not have any fields, we use to display an empty sheet. It was confusing and not useful.
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In `sheet_per_report_section` mode if the report do not have any fields, we use to display an empty sheet. It was confusing and not useful.
mentioned in merge request !320 (merged)
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