adding GIF images trought djangocms_frontend.contrib.image doesnt work!

[svandeneertwegh]

Describe the bug
When adding a picture plugin, selecting from filer a .gif image works but then it goes wrong.
Error from server : "OSError: cannot write mode P as JPEG"

To Reproduce
Steps to reproduce the behavior:

1. Go page edit mode
2. Click on adding Image
3. Select gif from filer
4. See error

Screenshots

[fsbraun]

@svandeneertwegh Can you give the full traceback - and an example gif that fails?

[fsbraun]

@svandeneertwegh Have you checked experimental support for animated images here? https://github.com/SmileyChris/easy-thumbnails/blob/d4e8d0cb72c712f0e2310ac05ee5b520c304d684/docs/ref/animated_formats.rst