fix(library/mt_task_queue): fix abort
fix(library/mt_task_queue): fix abort

Kha/lean,johoelzl/lean,dselsam/lean,leanprover-community/lean,rlewis1988/lean,Kha/lean,rlewis1988/lean,fpvandoorn/lean,rlewis1988/lean,leanprover/lean,johoelzl/lean,leodemoura/lean,digama0/lean,leanprover-community/lean,leanprover/lean,Kha/lean,leanprover-community/lean,dselsam/lean,leanprover-community/lean,leodemoura/lean,johoelzl/lean,leodemoura/lean,leanprover/lean,avigad/lean,fpvandoorn/lean,leodemoura/lean,Kha/lean,digama0/lean,dselsam/lean,fpvandoorn/lean,leanprover/lean,avigad/lean,avigad/lean,digama0/lean,leanprover-community/lean,johoelzl/lean,avigad/lean,rlewis1988/lean,johoelzl/lean,avigad/lean,dselsam/lean,Kha/lean,leanprover-community/lean,avigad/lean,rlewis1988/lean,fpvandoorn/lean,digama0/lean,leanprover/lean,rlewis1988/lean,fpvandoorn/lean,digama0/lean,dselsam/lean,fpvandoorn/lean,dselsam/lean,johoelzl/lean,leodemoura/lean,Kha/lean,leodemoura/lean,leanprover/lean,digama0/lean