I want to exclude posts that only have the Uncategorized category (i.e. category id 1), but if a post is (erroneously) categorised as "Uncategorized" but also has other categories, I want to include it.
Every solution I've found so far excludes all posts with the Uncategorized category, whether they have other categories or not. I've tried:
'category__not_in' => array('1')
'cat' => -1
in the query arguments but I'm not getting the results I need. Is there a way around this?