Merge pull request #350 from nickago/MM-1684

MM-1684 Refactored code to remove errors on startup

web/react/components/sidebar_header.jsx

@@ -87,7 +87,7 @@ var NavbarDropdown = React.createClass({
                 }
             });
         }
-        teams.push(<li><a href={utils.getWindowLocationOrigin() + '/signup_team'}>Create a New Team</a></li>);
+        teams.push(<li key='newTeam_li'><a key='newTeam_a' href={utils.getWindowLocationOrigin() + '/signup_team' }>Create a New Team</a></li>);
 
         return (
             <ul className='nav navbar-nav navbar-right'>