Yes, Wardens can not spec in block at this patch.

However,

They do have shields, and reaction styles from block so they do have a base block level and can spec in mastery of blocking.

My question is, is templating +11 in block for a warden adding to that base block % or is it wasted.

Base chance to Block = 5% + (0.5% x Shield spec) + 3% per level of Mastery of Blocking.

So is adding +11 template points in effect doubling a wardens block %?

Adding +11 to shield on a class that can't spec shield does nothing.