[TDF] Pass a vector of weights which is of the right lenght
[TDF] Pass a vector of weights which is of the right lenght

this is unfortunately a workaround: TH1::FillN should accept
nullptr as third argument when needed.

gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root,gganis/root