Problem
When you are using on the fly image manipulations but an svg is selected in the entry file field the template tags print the following error message in place of the file url:

Unable to gather properties of the image. Please make sure the image is valid and readable.
Your server does not support the GD function required to process this type of image.

Possible Solution
Since svg is a file type that sits somewhere between a text file and an image I think it would make logical sense for the image manipulations to be bypassed when the file type is an svg and just print the file url of the original. It could still be treated as an image by the cp so users could see the rendered image in the file manager.