404 error in IE

[webtrainingwheels]

When LazyLoad is active in IE it generates an additional request which is seen as "pending" in the browser, and can be reported as a 404 by logging tools. This request isn't present in Chrome and FF.
LazyLoad itself seems to still work.

IE 11:

https://www.webpagetest.org/result/171228_8A_35db68854400ac37eb4ade413f8a3666/1/details/#step1_request11

IE 16 / Edge:

example ticket:
https://secure.helpscout.net/conversation/491305864/56100/?folderId=273764

[remyperona]

That should be fixed with the new way to load the lazyload script