title: increasing cell total votes value swift
body: <p>For every cell in my table view, I have an upvote value for the number of upvotes that each cell will have. Right now, I'm increasing the number of upvotes based on the touch of a button that is also inside the cell.  I declared the sweetVotes outlet in the cell subclass. </p>
  
  <p>I keep getting the following error on the "let indexpath:NSIndexpath..." line when I try pressing the button:</p>
  
  <pre><code>    *Thread 1: EXC_BAD_INSTRUCTION(code=I386_INVOP,subcode=0x0)*
  </code></pre>
  
  <p>and this in the log:</p>
  
  <pre><code>fatal error: unexpectedly found nil while unwrapping an Optional value
  (lldb) 
  </code></pre>
  
  <p>Here is my code</p>
  
  <pre><code>  @IBAction func upvote(sender: AnyObject) {
  
          let indexPath: NSIndexPath = self.tableView.indexPathForSelectedRow()!
  
          let cell:SweetTableViewCell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as SweetTableViewCell
  
          var a:Int? = cell.sweetVotes.text?.toInt()
          a = a!+1
          cell.sweetVotes.text = "\(a)"
  
      }
  </code></pre>