title: Camelot-py throws error when passing correct table_areas
body: <p>I'm passing position of the table in the unit of <strong>points</strong> in the order of top, left, bottom, width. Also verified the position using GIMP. Below you can see the code. I have to pass the position in points or I have to convert into another format. If yes, please suggest me how to convert?</p>
  <pre><code>res = [&quot;433, 64, 697, 612&quot;] 
  
  camelot.read_pdf(self.file_path,flavor='stream', pages= str(page_number + 1),
                                      table_areas=res, edge_tol=500)  
  </code></pre>
  <blockquote>
  <p>ValueError: min() arg is an empty sequence</p>
  </blockquote>
  <p>The above code throws this particular error. What I'm supposed to pass. If I don't pass then all the tables comes together that's why I want to pass the co-ordinates.</p>