### Bug Description In an application with `always_repack=False`, at least one part is needed to ensure `prime_state_timestamp` is not `None`: https://github.com/canonical/craft-application/blob/109efee05914b24832763335c1d7064af4ed21f5/craft_application/commands/lifecycle.py#L470-L475 ### To Reproduce ```bash cat <<'EOF' >testcraft.yaml name: temp version: "0.1" base: ubuntu@24.04 platforms: amd64: EOF testcraft pack testcraft pack cat <<'EOF' >testcraft.yaml name: temp version: "0.1" base: ubuntu@24.04 platforms: amd64: parts: foo: plugin: nil EOF testcraft pack testcraft pack ``` Expected behaviour: the second and fourth `testcraft pack` calls should print `Already packed: temp-0.1-amd64.testcraft`. Actual behaviour: only the fourth one does. ### part yaml ```shell {} ``` ### Relevant log output ```shell :: 2025-08-06 12:49:51.687 Could not find prime state timestamps. ```