Return empty data frame in V4 API when 0 results

[rodjacka]

The method GoogleAnalyticsQueryV4.execute_query throws an exception when 0 results are returned.

TypeError: 'NoneType' object is not iterable

The expected behaviour would be to return an empty dataframe or a None value

[DeliciousHair]

The fact that that code is still a horrible mess aside, it shouldn't do that. Can you post a full error message (sensitive data censored of course) showing what is breaking? I suspect this is quite a small fix, and a good opportunity to make the method less of a mess.