grid: checks for `$grid-columns > 0` (#30605)
grid: checks for `$grid-columns > 0` (#30605)

Co-authored-by: Martijn Cuppens <eb1e95cd7406bd48b9f875e0ae2b2d93fd22c202@gmail.com>
GerHobbelt/bootstrap,inway/bootstrap,coliff/bootstrap,inway/bootstrap,zalog/bootstrap,twbs/bootstrap,tjkohli/bootstrap,tjkohli/bootstrap,zalog/bootstrap,twbs/bootstrap,coliff/bootstrap,GerHobbelt/bootstrap,m5o/bootstrap,m5o/bootstrap,GerHobbelt/bootstrap,inway/bootstrap,zalog/bootstrap