compatibility to froxlor 0.9.32

Ay

Due to this [commit](https://github.com/Froxlor/Froxlor/commit/b4a345d182ee7f06e9a027115aadbd3fc70cd454#diff-2) add least a empty config.json file is needed. With this merge your theme will be visible again in the admin panel.
Thanks for your work!

binzram