Adds possibility to raise error when response parsing fails
Google, Okf lookup: fix exception in case response is no valid json

Google and Okf perform additional checks to determine if a request is
valid. It needs to be checked first if json parsing succeeded before
accessing values of it, or else an error will occur.
Merge pull request #768 from spiderpug/raise-response-parse-error

Adds ability to raise error when response parsing fails