Fans of the NBC comedy “Community” were left in limbo when the network pulled the show from its midseason lineup. But fear not, it will be back before you know it. NBC announced on Tuesday that the show would be back on March 15 in its usual 8 p.m. timeslot, finishing up its third season. Fellow NBC comedy “Parks and Recreation” will take a break starting that night, but it is already scheduled for an April 19 return.