canvas.Fit() throws exception if there is no layer

[ttt43ttt]

No description provided.

[tdewolff]

This is not going to work as it includes (0,0) as a point to which we will fit the canvas. I suggest instead that we treat the absence of layers as a special case.

[ttt43ttt]

Actually I think if there is nothing in the canvas, calling Fit() should make the canvas have width/height equal to 2*margin/2*margin instead of 0/0, which makes the value continuous.
Hope you can consider it again. Thanks!

[tdewolff]

Sorry to get back so late!