title: error showing x tick labels on shared subplots - 'silent_list' object has no attribute 'set_visible'
body: <p>i'm trying to show xtick lables on the subplots through the following code</p>
  <pre><code>ax1.hist(x1, normed = True, bins= 50, alpha= 0.5)
  ax2.hist(x2, normed=True, bins=20, alpha=0.5)
  ax3.hist(x3, normed=True, bins=20, alpha=0.5)
  ax4.hist(x4, normed=True, bins=20, alpha=0.5)
  
  axs = [ax1, ax2, ax3, ax4]
  dis = ['normal', 'gamma', 'exponential', 'uniform']
  for i in range(0, len(axs)):
      axs[i].set_title('x' + str(i+1) + dis[i])
      axs[i].set_xticklabels([])
      axs[i].get_yticklabels().set_visible(True)
  </code></pre>
  <p>I'm getting the following error in matplotlib</p>
  <pre><code>&lt;ipython-input-2-d6371e87b196&gt; in &lt;module&gt;()
       10     axs[i].set_title('x' + str(i+1) + dis[i])
       11     axs[i].set_xticklabels([])
  ---&gt; 12     axs[i].get_yticklabels().set_visible(True)
       13 
       14 
  
  AttributeError: 'silent_list' object has no attribute 'set_visible'
  </code></pre>