<VV> Missing? carb hose

[ralphsebrell at aol.com]

Today while trying  to figure why my 140 runs rough, I noticed a "hose barb" on the primary on the driver's side might be missing a hose. 
It is under the white disk (standing on it's side) that has its own hose to the bottom of the carb. On the pass side primary, the barb in question has a hose that runs to the vacuum advance on the distributer.
Shouldn't there be something on the barb on the drivers carb?
Trying to learn
Ralph 
65 Corsa