The linesman trailing the play is the one who initiates an icing call, and it doesn't look like he ever did. The linesman who everyone is blaming on this play can't make the call if the other guy doesn't initiate it. It looks like he also waves it off anyway because the puck went right past an Ottawa guy before leaving the zone, he just opted to play the body rather than the puck.
Sogaard really didn't have it covered, he was expecting a whistle for icing, but since the goalie has a view of the whole ice, he's supposed to look at the linesman and let his players know if icing is about to be called or not. When the puck came to him, despite there being no whistle, he didn't really cover the puck like he was trying to freeze it. It was behind his blocker but wasn't really covered. People are bashing the linesman for not calling icing--maybe it could have been but I also see why it was waved off--when really it's Sogaard that butchered this play in multiple ways. This is a good call. If Sogaard just covers it like normal, or lets his defenseman know icing is waved off, then nothing happens on this play.