invert is broken when r/g/b is 0 #45
Description
invert('#000000').hex should give #FFFFFF but gives #000000, similarly
invert('#EE00EE').hex should give #11FF11 but gives #110011
{{ message }}
invert('#000000').hex should give #FFFFFF but gives #000000, similarly
invert('#EE00EE').hex should give #11FF11 but gives #110011