bugfix incorrect processing module result handling
bugfix incorrect processing module result handling

As a dictionary with one key/value pair was returned by the process
function, the if result check would never return failure. This can
result in an "null": "null" and similar entry in the json report.

cuckoobox/cuckoo,cuckoobox/cuckoo,cuckoobox/cuckoo,cuckoobox/cuckoo,cuckoobox/cuckoo