title: Easy way to see if DataView is empty?
body: <p>Using the Google visualization api, is there an easy way to see if a DataView is empty?</p>
  
  <p><a href="https://developers.google.com/chart/interactive/docs/reference#DataView" rel="nofollow">https://developers.google.com/chart/interactive/docs/reference#DataView</a></p>
  
  <p>I can see perhaps using dataView.getValue(0, 1) etc to check for nulls, but it also contains column headings.</p>
  
  <p>I'm guessing it's tricky as the dataview could have many different formats, but is there a good generic way of checking for empty data views? I'm using the dataview for a pie chart.</p>