title: Bigquery data not getting inserted
body: <p>I'm using python client library to insert data to big query table. The code is as follows.</p>
  
  <pre><code>client = bigquery.Client(project_id)
  errors = client.insert_rows_json(table=tablename,json_rows=data_to_insert)
  assert errors == []
  </code></pre>
  
  <p>There are no errors, but the data is also not getting inserted. </p>
  
  <p>Sample JSON rows:</p>
  
  <pre><code>[{'a':'b','c':'d'},{'a':'f','q':'r'},.....}]
  </code></pre>
  
  <p>What's the problem? No exception also</p>