cubicweb #3705752 avoid double unicode decoding in ucsvreader [validation pending]

prioritynormal
typebug
done in3.18.5
load0.100
load left0.000
closed by#c90107199dea [dataimport] Avoid double unicode decoding in ucsvreader (closes #3705752)
patch[dataimport] Avoid double unicode decoding in ucsvreader (closes #3705752) [applied]