JSON::ParserError when handling queries that redirect to another search engine.

[woodruffw]

Hello,

DuckDuckGo queries like !g apple redirect to the search engine specified after the bang (g is Google, w is Wikipedia, etc). This causes the API to return HTML not JSON, causing a parser error on duck_duck_go.rb:49.

The ugly fix is just to guard the JSON.parse call. A better one might be to check the origin of the data being received (not sure if that's possible yet, haven't done enough research).

Best, William