transition() mixin prevent redundant 'transition: none' and pass `null` (#30391)
transition() mixin prevent redundant 'transition: none' and pass `null` (#30391)

* Prevent redundant 'none' for prefers-reduced-motion

* Output warning when use 'none' or 'null' with multiple arguments

* Fix for libsass(node-sass)

GerHobbelt/bootstrap,inway/bootstrap,twbs/bootstrap,m5o/bootstrap,zalog/bootstrap,GerHobbelt/bootstrap,zalog/bootstrap,tjkohli/bootstrap,inway/bootstrap,twbs/bootstrap,inway/bootstrap,GerHobbelt/bootstrap,coliff/bootstrap,tjkohli/bootstrap,zalog/bootstrap,coliff/bootstrap,m5o/bootstrap