Invalid image URL when loadFromJSON causes inconsistency

[pedrofs]

Hey guys,

I'm loading a canvas from JSON. The scenario I have here is simple: One of the images has a broken link.

It causes this specific object to have _element property and _originalElement property to be null and then when I try to JSON.stringify(canvas) it raises an error:

Uncaught TypeError: Cannot read property 'src' of null. fabric.Image.fabric.util.createClass.toObject @ fabric.js:17106

Looking at this line I can see:

src: this._originalElement.src || this._originalElement._src,

For now I'll check after loading the canvas for every image without this properties properly set and try to remove them but I think we should somehow avoid this inconsistency.

Do you have any thoughts?

Thanks and best.