Using $node.data_map, you get an array of all the attributes, where the array keys are the attribute names.
So using is_set($node.data_map.body) should work to test it attribute "body" is present.
If you have different attributes with the same name in different classes (eg. body is either a line of text or an xml block) you can use {attribute_view_gui} in your node template to avoid hardcoding a lot of "if" switches...
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