Ignoring a null string in the filter list

When I import a bunch of products in a CSV file, some of them need to have a blank space in certain feature fields. This is where a particular feature does not apply to a particular product, so it's not necessary.

Is there a way for CS cart to ignore these situations in the filter? As it is now, I have a blank space showing up in the filter list with the number indicating how many of these “phantom features” are “available”.

Obviously, I'd like the filter to simply ignore these unnecessary entries. Is there a way to do this?

So your import has a field with the 'null' data like so:

" "

Note the space. Importing as below should avoid this: