get_checkout_branch
Description:
Gets the name of the branch to checkout or null.
Parameters:
| this | 
           a CloneOptions.  | 
      
Returns:
| 
           the name of the branch to checkout or null.  | 
      
Gets the name of the branch to checkout or null.
| this | 
           a CloneOptions.  | 
      
| 
           the name of the branch to checkout or null.  |