Results-Page: Infinite loading of broken images

[Karinon]

If an results-image in a result-page is broken (either not existing or no permissions), freva-web show a infinite spinner. This is due to the library jquery lazyload which is used to..well..lazy load the images. It has no understanding of error cases and will show the loading-image the whole time.

We have to replace lazyload by something different. Since we are not the first ones with this issue, the are dozens of fixed lazyload-versions out there...