syntax search question

You basically specify that the article must not be present.

The Terminal Node in Cascadia effectively is the same as a Word. You select "Determiner" = Article and choose "Is not present" rather than the default "is present".

In OpenText you would use a Modifier term and select "Specifier" for the article.

Both methods avoid having to define a Word whose morphology is "Article"!  Because the determiner and clause are in different nodes, it ensures that the noun is anarthrous irrespective of intervening words eg. the marvellous boat would be considered anarthrous if we only looked at words (marvellous) immediately before the noun!