Custom css minifiers

[oguzhankahyaoglu]

Hello,

I tried to add a new css minifier reference just i have always been using for jsminifiers, but it does not work. I oftenly use NullMinifier in order not to minify some of my files because they contain hacks which results in empty results.
I am defining my null js minifier as:

I am trying the same for css, but not working. I am using version 2.2.2.18 by the way. If this is not a bug (a non-existing feature), it will be very good to have IMO.

Thanks.