Show keywords with 0 images

Is it possible to clean up the keywords?

Or only show keywords with 0 images?

When I add a keyword to an image and I have a typo, I remove the keyword and add the correct typed one or correct the spelling directly of it.

But this creates duplicates.

For example I add the keyword "landscap" (with missing e) and then correct it to "landscape".

My keyword list then contains two keywords "landscap" and "landscape".

"landscap" has 0 images and "landscape" has 1 image.

In this small scale it's no problem to detect. But with over 300 keywords it gets quiet messy.

Any suggestion for this problem?

Currently I try to remember what I entered before, search for the "wrong" keyword and delete it. But this is pretty time consuming...