liquid_feedback_frontend: env/format/percent

liquid_feedback_frontend

Set identification to null if empty string

rev	line source
bsw@1210	1 function format.percent_floor(p, q)
bsw@1210	2 if q > 0 then
bsw@1210	3 return math.floor(100 * p / q) .. "%"
bsw@1210	4 else
bsw@1210	5 return "0%"
bsw@1210	6 end
bsw@1210	7 end