You could create a Smartlist that would keep track of all the empty fields.
Right-click on Playlists and choose Add Smartlist and name it whatever you want. When you select that Smartlist, on the right side of MJ near the top, you have two fields, Search & Summary. At the end of the Search field, there is a button that has 3 dots (...) on it. Click on it and choose Add Keyword. From the keyword list choose the fields that you want to keep track of. Since you want to track fields that are empty, the keywords should look like this, for example: genre="" album="" (those are quote marks with nothing inbetween them).
You might have to play around a little with the Year keyword to get it to sort the way you want it. The Year field is not empty since MJ puts a 0 (zero) in it if you leave it blank, so if you set up the keyword year="0", you end up with any year that has a 0 in it being listed.
Anyway, all the info about Smartlists is in the MJ help. As you play around with it, you'll start to realize how powerful it is.
Rob