cubicweb-file #1913865 Binary returned by .thumbnail should have 'filename' attribute [resolved]

as Binary provided by the web interface (eg FileField)

prioritynormal
typebug
done in1.10.4
load0.100
load left0.000
closed by#7a5d3d7f0a88 closes #1913865: Binary returned by .thumbnail should have 'filename' attribute