fix(library/module_mgr): do not create olean files for modules with errors
fix(library/module_mgr): do not create olean files for modules with errors

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