Fix crash when loading boards

arduino/cores/packagemanager/loader.go

@@ -384,19 +384,16 @@ func (pm *PackageManager) loadBoards(platform *cores.PlatformRelease) error {
 	} else {
 		platform.Menus = properties.NewMap()
 	}
+	// This is not a board id so we remove it to correctly
+	// set all other boards properties
+	delete(propertiesByBoard, "menu")
 
 	if !platform.PluggableDiscoveryAware {
 		for _, boardProperties := range propertiesByBoard {
 			convertVidPidIdentificationPropertiesToPluggableDiscovery(boardProperties)
 		}
 	}
 
-	platform.Menus = propertiesByBoard["menu"]
-
-	// This is not a board id so we remove it to correctly
-	// set all other boards properties
-	delete(propertiesByBoard, "menu")
-
 	skippedBoards := []string{}
 	for boardID, boardProperties := range propertiesByBoard {
 		var board *cores.Board

test/test_core.py

@@ -712,3 +712,39 @@ def test_core_with_wrong_custom_board_options_is_loaded(run_command, data_dir):
         + "skipping loading of boards arduino-beta-dev:platform_with_wrong_custom_board_options:nessuno: "
         + "malformed custom board options"
     ) in res.stderr
+
+
+def test_core_with_missing_custom_board_options_is_loaded(run_command, data_dir):
+    test_platform_name = "platform_with_missing_custom_board_options"
+    platform_install_dir = Path(data_dir, "hardware", "arduino-beta-dev", test_platform_name)
+    platform_install_dir.mkdir(parents=True)
+
+    # Install platform in Sketchbook hardware dir
+    shutil.copytree(
+        Path(__file__).parent / "testdata" / test_platform_name, platform_install_dir, dirs_exist_ok=True,
+    )
+
+    assert run_command("update")
+
+    res = run_command("core list --format json")
+    assert res.ok
+
+    cores = json.loads(res.stdout)
+    mapped = {core["id"]: core for core in cores}
+    assert len(mapped) == 1
+    # Verifies platform is loaded except excluding board with missing options
+    assert "arduino-beta-dev:platform_with_missing_custom_board_options" in mapped
+    boards = {b["fqbn"]: b for b in mapped["arduino-beta-dev:platform_with_missing_custom_board_options"]["boards"]}
+    assert len(boards) == 1
+    # Verify board with malformed options is not loaded
+    assert "arduino-beta-dev:platform_with_missing_custom_board_options:nessuno" not in boards
+    # Verify other board is loaded
+    assert "arduino-beta-dev:platform_with_missing_custom_board_options:altra" in boards
+    # Verify warning is shown to user
+    assert (
+        "Error initializing instance: "
+        + "loading platform release arduino-beta-dev:platform_with_missing_custom_board_options@4.2.0: "
+        + "loading boards: "
+        + "skipping loading of boards arduino-beta-dev:platform_with_missing_custom_board_options:nessuno: "
+        + "malformed custom board options"
+    ) in res.stderr