title: ui-grid pagination page forward button not disabled even with 0 record
body: <p>I am using <code>ui-grid</code> for my tables, with <code>externalpagination</code> and <code>externalfiltering</code> set to true. When the <code>$http</code> returns no record after searching, the <code>page-forward button</code> should be disabled, but it doesn't, which cause issues ahead.</p>
  
  <p>Here's an image<a href="https://i.stack.imgur.com/no6Hm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/no6Hm.png" alt="enter image description here"></a> </p>
  
  <p>Here's the image of it, which shows the button still visible. Please help me out. Stuck with this for a while</p>