Is there a way to filter Subscription level in the all members list by Un categorized?

I know I have a plugin issue but I can not determine which one it is....that being said I can not advance pages in my All Members area of Membership. The system we have set up is not hole proof and one of the holes is if a new user doesn't complete the subscription process. Whats been happening is a user will finish the data input but not click subscribe. When this happens the user is registered but is not given a access level. for instance we have free and paid and if the user falls into the hole the subscription and membership levels are blank. Currently I can not figure out how to filter the list to show all users with out any data in the subscription or membership levels.

aside from the obvious fix the plugin and update the membership files answer...is there a way to filter the list?