twitch: check for subscription when deleting
twitch: check for subscription when deleting

Former-commit-id: b4ecffb0d1d4710986356e24b700639f8f9e4ee9
Former-commit-id: f9cbefcf02086785448c3bfa4e71b1b8ff2c6c68
haste/ivar2,torhve/ivar2,torhve/ivar2,torhve/ivar2