Regression: Prevent startup errors for mentions parsing (#14219)
Regression: Prevent startup errors for mentions parsing (#14219)

Sometimes `Meteor.user()` is falsy even with `Meteor.userId()` defined.
inoio/Rocket.Chat,VoiSmart/Rocket.Chat,VoiSmart/Rocket.Chat,Sing-Li/Rocket.Chat,subesokun/Rocket.Chat,4thParty/Rocket.Chat,subesokun/Rocket.Chat,inoio/Rocket.Chat,subesokun/Rocket.Chat,Sing-Li/Rocket.Chat,Sing-Li/Rocket.Chat,VoiSmart/Rocket.Chat,4thParty/Rocket.Chat,4thParty/Rocket.Chat,subesokun/Rocket.Chat,Sing-Li/Rocket.Chat,4thParty/Rocket.Chat,inoio/Rocket.Chat