fix a bug when hidding the time of a session 
fix a bug when hidding the time of a session 

Only if the previous one is at the same time.

Signed-off-by: Christopher Guindon <68181ce00e5d8ae7372351238fb57dd3eea389bb@eclipse.org>
EclipseFdn/fedgeoday,EclipseFdn/fedgeoday,EclipseFdn/fedgeoday