title: Don't display not present date values
body: <p>I'm trying to get Highcharts to display the daily usage statistics for e.g. a company's ressource. The opening days of the company are from monday to friday.</p>
  
  <p>My dataseries look like this:</p>
  
  <pre><code>[Date.UTC(2012, 8, 6),17.5], (Thu)
  [Date.UTC(2012, 8, 7),42.5], (Fri)
  -- weekend
  [Date.UTC(2012, 8, 10),20],  (Mon)
  [Date.UTC(2012, 8, 11),20],  (Tue)
  [Date.UTC(2012, 8, 12),40],  (Wed)
  [Date.UTC(2012, 8, 13),30],  (Thu)
  ...
  </code></pre>
  
  <p>In the time series chart there are inserted two labels for the missing two weekend-dates (2012, 8, 8 and 2012, 8, 9), but I don't want those labels to be displayed because there are no values for these labels and so the adjacent dates will be connected via a line but this is wrong.</p>
  
  <p>Is it possible to turn off this 'date interpolation' and show only the values I've inserted?</p>
  
  <p>Thanks with regards, Phil</p>