Avoid crashing on "scale(1)" (short for "scale(1, 1)")
Created by: nthykier
The scale function on the transform attribute has a short form, where only the first argument is used. But optimizeTransform would always assume that there were two when checking for the identity scale.
Closes: #190 (closed) Signed-off-by: Niels Thykier niels@thykier.net