When a group has only one item, you can create a Custom Grouping Engine and override the IsChildVisible() property to display the single item group without a caption.
In the override, you have check whether the passed-in element is a CaptionSection, and then check its record count, to decide whether it returns True or False, indicating whether the caption is to be displayed or not.
To make sure that the single record CaptionSection is always displayed as expanded, you can add a check to the IsChildVisible override when the passed-in element is a DetailsSection.
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