title: Suppressing a MatPlotLib benign warning
body: <p>I'm plotting a few different graphs, and I don't want to have a legend since I don't need it.</p>
  
  <pre><code>ax.scatter(x, y, ..., label='')
  </code></pre>
  
  <p>The above works just fine for me, but it sends a UserWarning out. 
  I know it's benign and doesn't actually affect the program at all, but I'd like to find a way to not have it.</p>
  
  <p>I know you can suppress all warnings in python, but I just want to suppress this specific warning. </p>
  
  <p>Oh and removing <code>label=''</code> still makes the warning.</p>
  
  <p>Thank in advance</p>