title: Repeated graph in altair
body: <p>I am attempting to create a repeated graph in altair.</p>
  
  <p>Here is my code: </p>
  
  <pre><code>x = alt.Chart(data).mark_bar().encode(
      alt.X(alt.repeat("row"), type='quantitative'),
      alt.Y(alt.repeat("column"), type='quantitative')
  ).repeat(
  row= ['country'],
  column=['alcohol_use', 'drug_use', 'high_meat', 'low_exercise', 'smoking'])
  </code></pre>
  
  <p>When I run it, it just shows graphs with axes and nothing else. What could be wrong?</p>