How to debug'None' category issues when using controller rich filter gadget,it doesnt display list?

[Saurabhi]

I am using rich filter based gadgets, controller gadget has all filters in place(smart filters,queues ,views etc). Now I have data segregated monthly and then when I select particular month, it displays data but there's always a 'None' category which I am clueless about- it doesnt bring up list of issues in None category to check which are those issues not matching any clauses? How should I resolve this?