static empty attributes are not removed
static empty attributes are not removed

option value="" text

generates

<option value="">text</option>

Dynamic empty attributes are still removed.

slim-template/slim,ericboehs/slim,raxoft/slim,fly19890211/slim,etdev/slim,zakuro9715/slim,cheunghy/slim,etdev/slim,XueQian/slim,ericboehs/slim,ruijsun/slim,metallurgical/slim,JuanitoFatas/slim,cheunghy/slim,slim-template/slim,XueQian/slim,Nikeshsuwal/slim,sideci-sample/sideci-sample-slim,raxoft/slim,JuanitoFatas/slim,ruijsun/slim,Nikeshsuwal/slim,zakuro9715/slim,mojavelinux/slim,metallurgical/slim,mojavelinux/slim,fly19890211/slim,yterajima/slim,slim-template/slim