Revert "Require package entries in pylock files"

crates/uv-resolver/src/lock/export/pylock_toml.rs

@@ -204,6 +204,7 @@ pub struct PylockToml {
     pub dependency_groups: Vec<GroupName>,
     #[serde(skip_serializing_if = "Vec::is_empty", default)]
     pub default_groups: Vec<GroupName>,
+    #[serde(skip_serializing_if = "Vec::is_empty", default)]
     pub packages: Vec<PylockTomlPackage>,
     #[serde(skip_serializing_if = "Vec::is_empty", default)]
     attestation_identities: Vec<PylockTomlAttestationIdentity>,

crates/uv/tests/pip/pip_sync.rs

@@ -6068,36 +6068,6 @@ fn pep_751() -> Result<()> {
     Ok(())
 }
 
-#[test]
-fn pep_751_requires_packages() -> Result<()> {
-    let context = uv_test::test_context!("3.12");
-
-    context.temp_dir.child("pylock.toml").write_str(
-        r#"
-        lock-version = "1.0"
-        created-by = "uv"
-        "#,
-    )?;
-
-    uv_snapshot!(context.filters(), context.pip_sync()
-        .arg("--preview")
-        .arg("pylock.toml"), @r#"
-    success: false
-    exit_code: 2
-    ----- stdout -----
-
-    ----- stderr -----
-    error: Not a valid `pylock.toml` file: pylock.toml
-      Caused by: TOML parse error at line 1, column 1
-          |
-        1 |
-          | ^
-        missing field `packages`
-    "#);
-
-    Ok(())
-}
-
 #[test]
 fn pep_751_require_hashes_directory() -> Result<()> {
     let context = uv_test::test_context!("3.12");