`Solve() of `llb.Scratch()` returns a `nil` reference. This causes Pipelines with no operations to panic when interacted with, because of `nil` pointer de-reference. Mitigates #189 and #184 Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
`Solve() of `llb.Scratch()` returns a `nil` reference. This causes Pipelines with no operations to panic when interacted with, because of `nil` pointer de-reference. Mitigates #189 and #184 Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>