Fixed incorrect API calls

Author: not-my-username

core/components/FixtureGroup.gd

@@ -168,7 +168,7 @@ func _add_group_items(group_items: Array) -> void:
 func _remove_fixture(fixture: Fixture, no_signal: bool = false) -> bool:
 	if not _fixtures.has(fixture): return false
 
-	_fixtures[fixture].local_delete()
+	_fixtures[fixture].delete()
 	_fixtures.erase(fixture)
 
 	if not no_signal:

core/components/fixtures/DMXFixture.gd

@@ -151,6 +151,9 @@ func get_current_value(p_zone: String, p_parameter: String, p_allow_default: boo
 
 ## Gets all the zones
 func get_zones() -> Array[String]:
+	if not is_instance_valid(_manifest):
+		return []
+	
 	return _manifest.get_zones(_mode)
 
 

core/engine/Engine.gd

@@ -287,7 +287,6 @@ func _set_file_name(p_file_name: String) -> void:
 	file_name_changed.emit(_current_file_name)
 
 
-
 ## Internal: Resets this engine to its default state
 func _reset():
 	print("Performing Engine Reset!")
@@ -296,4 +295,4 @@ func _reset():
 
 	for object_class_name: String in _config.root_classes:
 		for component: EngineComponent in ComponentDB.get_components_by_classname(object_class_name):
-			component.local_delete()
+			component.delete()