@Nullable
    public static String getResponseData(final Response response, final boolean replaceWhitespace) {
        return response.isSuccessful() ? getResponseDataNoError(response, replaceWhitespace) : null;
    }
Get the body of a HTTP response.

@param response          a HTTP response
@param replaceWhitespace {@code true} if {@link TextUtils#replaceWhitespace(String)}
                         should be called on the body
@return the body if the response comes from a successful HTTP request, {@code null} otherwise
main/src/main/java/cgeo/geocaching/network/Network.java