Offer to join a room if you're not in it

skins/base/views/organisms/RoomView.js

@@ -83,10 +83,18 @@ module.exports = React.createClass({
 
     render: function() {
         if (!this.state.room) {
+            if (this.props.roomId) {
+                return (
+                    <div>
+                    <button onClick={this.onJoinButtonClicked}>Join Room</button>
+                    </div>
+                );
+            } else {
                 return (
                     <div />
                 );
             }
+        }
 
         var myUserId = MatrixClientPeg.get().credentials.userId;
         if (this.state.room.currentState.members[myUserId].membership == 'invite') {