Comment 10 for bug 1653184

Thanks for the fix!

A tutorial source is composed of an XML file for the text and structure, and some SVG files for the images. The final file is generated with some Java code that convert a source XML file to SVG and merge it with the images. Somewhere in the process it needs to calculate the size of the images, and something related to the warnings broke that part for one image file ('y' attribute set to 'NaN' or 'OINVALID' for some elements).