Destroy the activities and attachments if the channel is destroyed
Destroy the activities and attachments if the channel is destroyed

Signed-off-by: Akash Manohar J <e4cf979cf717fd295f4e4edc427ee1aee78fa7dc@akash.im>

leohmoraes/kandan,miurahr/kandan,sai43/kandan,leohmoraes/kandan,cloudstead/kandan,Stackato-Apps/kandan,leohmoraes/kandan,codefellows/kandan,kandanapp/kandan,ych06/kandan,miurahr/kandan,dz0ny/kandan,ipmobiletech/kandan,leohmoraes/kandan,ipmobiletech/kandan,sai43/kandan,kandanapp/kandan,cloudfuji/kandan,kandanapp/kandan,ivanoats/kandan,sai43/kandan,ivanoats/kandan,cloudstead/kandan,naughtystyle/jobster-room,ipmobiletech/kandan,miurahr/kandan,miurahr/kandan,cloudstead/kandan,moss-zc/kandan,moss-zc/kandan,arferreira/chatifollow,codefellows/kandan,Stackato-Apps/kandan,naughtystyle/jobster-room,Stackato-Apps/kandan,yfix/kandan,codefellows/kandan,arferreira/chatifollow,sai43/kandan,yfix/kandan,ivanoats/kandan,dz0ny/kandan,moss-zc/kandan,ivanoats/uw-ruby-chat,ych06/kandan,Stackato-Apps/kandan,moss-zc/kandan,kandanapp/kandan,yfix/kandan,ych06/kandan,cloudstead/kandan,ych06/kandan,cloudfuji/kandan,ipmobiletech/kandan,ivanoats/uw-ruby-chat,yfix/kandan,dz0ny/kandan