fix: skip platforms with no native list

export_native counted MinUI, NextUI and MyMinUI as failures although the registry marks them native_list: none: their code names no BIOS file, so there is no list of theirs to correct.

scripts/export_native.py

@@ -42,6 +42,7 @@ from common import (
     load_database,
     load_emulator_profiles,
     load_platform_config,
+    load_platform_registry,
     native_layer,
     require_platform,
     yaml_load,
@@ -814,11 +815,17 @@ def run(
     refresh_only: bool = False,
 ) -> int:
     exporters = discover_exporters()
+    registry = load_platform_registry(platforms_dir)
     failures = 0
     skipped: list[str] = []
 
     for platform in sorted(platforms):
         exporter_class = exporters.get(platform)
+        if not exporter_class and (registry.get(platform) or {}).get("native_list") == "none":
+            # The platform's code names no BIOS file: there is no list of its
+            # own to hand back corrected.
+            print(f"  SKIP {platform}: names no BIOS file of its own (native_list: none)")
+            continue
         if not exporter_class:
             skipped.append(platform)
             print(f"  SKIP {platform}: no exporter")

tests/test_exporters.py

@@ -565,6 +565,26 @@ class ExporterRegistry(unittest.TestCase):
         )
         self.assertEqual(registered - set(exporters) - _without_native_list(), set())
 
+    def test_a_run_over_a_platform_without_a_native_list_passes(self):
+        """export_native --all ran over MinUI, NextUI and MyMinUI and failed
+        the pipeline step for three platforms the registry says have nothing
+        to export. A platform with no exporter and no such mark still fails."""
+        import contextlib
+
+        import export_native
+
+        with tempfile.TemporaryDirectory(dir=REPO_ROOT / "tmp") as directory:
+            platforms = Path(directory)
+            (platforms / "_registry.yml").write_text(
+                "platforms:\n  cardonly:\n    native_list: none\n  unwritten: {}\n",
+                encoding="utf-8")
+            with contextlib.redirect_stdout(io.StringIO()) as out:
+                self.assertEqual(export_native.run(
+                    ["cardonly"], directory, directory, str(platforms), directory, False), 0)
+                self.assertEqual(export_native.run(
+                    ["unwritten"], directory, directory, str(platforms), directory, False), 1)
+            self.assertIn("SKIP cardonly: names no BIOS file of its own", out.getvalue())
+
     def test_a_platform_without_a_native_list_declares_no_file(self):
         """`native_list: none` says the platform's code names no BIOS file
         (MinUI hands each core a folder and opens nothing in it). A platform