sugar-datastore depends cjson which is an obsolete, unmaintained JSON serializer/deserializer for Python. python-cjson is going to be removed from Fedora.
Already on our todo list for the F-18 cycle, sure we already had bugs for this.
I found http://bugs.sugarlabs.org/ticket/3347 for sugar-datastore and http://bugs.sugarlabs.org/ticket/3142 for "sugar".
Fixed in 0.97.0 devel release. Built for F-18+