Ensured scaling to 0 is not possible, and axes with size 0 are ignored.
Also greyed out "Scale All" button if axis' size is 0. (Previously only
"Scale Selected") was greyed out.
Done this because while an axis with size 0 is selected, pressing "Scale all" automatically scaled all axes to 0.001, which can break models with short segments. (I don't know why, probably their size is being rounded to 0)
Ensured scaling to 0 is not possible, and axes with size 0 are ignored.
Also greyed out "Scale All" button if axis' size is 0. (Previously only "Scale Selected") was greyed out. Done this because while an axis with size 0 is selected, pressing "Scale all" automatically scaled all axes to 0.001, which can break models with short segments. (I don't know why, probably their size is being rounded to 0)