[core] Fixed a missing group stats initialization
[core] Fixed a missing group stats initialization

Cinegy/srt,Cinegy/srt,Haivision/srt,Haivision/srt,ethouris/srt,Cinegy/srt,Cinegy/srt,Haivision/srt,ethouris/srt,ethouris/srt,ethouris/srt,Haivision/srt