prevent crash on sound_player with placeholder

mpfmc/core/mc_placeholder_manager.py

@@ -10,7 +10,7 @@ def get_global_parameters(self, name):
         if name == "settings":
             return self.machine.settings
         elif name == "machine":
-            return MachinePlaceholder(self.machine)
+            return False
         elif self.machine.player:
             if name == "current_player":
                 return self.machine.player

mpfmc/integration/machine_files/sound/config/config.yaml

@@ -0,0 +1,41 @@
+#config_version=5
+sound_system:
+  buffer: 2048
+  frequency: 44100
+  channels: 2
+  master_volume: 0.9
+  tracks:
+    music:
+      volume: 0.5
+      simultaneous_sounds: 1
+    sfx:
+      volume: 0.4
+      simultaneous_sounds: 8
+      preload: yes
+    voice:
+      volume: 0.6
+      simultaneous_sounds: 1
+      preload: yes
+
+assets:
+    sounds:
+        default:
+            load: preload
+        voice:
+            load: preload
+            track: voice
+        sfx:
+            load: preload
+            track: sfx
+        music:
+            load: on_demand
+            track: music
+        loops:
+            load: preload
+            track: sfx
+        playlist:
+            load: on_demand
+            track: sfx
+
+sound_player:
+  machine_var_factory_reset_current_selection{machine.factory_reset_current_selection==2}: 210871_synthping

mpfmc/integration/machine_files/sound/sounds/license.txt

@@ -0,0 +1,2 @@
+All sounds used in these tests were downloaded from www.freesound.org and are licensed under the
+Create Commons 0 License (http://creativecommons.org/publicdomain/zero/1.0/).

mpfmc/integration/test_Sound.py

@@ -0,0 +1,19 @@
+from mpfmc.tests.MpfIntegrationTestCase import MpfIntegrationTestCase
+
+
+class TestSound(MpfIntegrationTestCase):
+
+    def get_machine_path(self):
+        return 'integration/machine_files/sound'
+
+    def get_config_file(self):
+        return 'config.yaml'
+
+    def test_sound_player_with_conditionals(self):
+        self.machine.variables.set_machine_var("factory_reset_current_selection", 1)
+        self.mock_mc_event("sounds_play")
+        self.advance_time_and_run(1)
+        self.assertMcEventNotCalled("sounds_play")
+        self.machine.variables.set_machine_var("factory_reset_current_selection", 2)
+        self.advance_time_and_run(1)
+        self.assertMcEventCalled("sounds_play")