mac-syphon: Disable inject functionality on macOS 10.15+

Also disables errors in log resulting from empty strings being passed
to `obs_data_create_from_json`.

plugins/mac-syphon/syphon.m

@@ -467,10 +467,15 @@ static void *syphon_create_internal(obs_data_t *settings, obs_source_t *source)
 		return NULL;
 	}
 
-	const char *inject_info = obs_data_get_string(settings, "application");
-	s->inject_info = obs_data_create_from_json(inject_info);
-	s->inject_active = obs_data_get_bool(settings, "inject");
-	s->inject_app = @(obs_data_get_string(s->inject_info, "name"));
+	if (@available(macOS 10.15, *)) {
+		s->inject_active = false;
+	} else {
+		const char *inject_info =
+			obs_data_get_string(settings, "application");
+		s->inject_info = obs_data_create_from_json(inject_info);
+		s->inject_active = obs_data_get_bool(settings, "inject");
+		s->inject_app = @(obs_data_get_string(s->inject_info, "name"));
+	}
 
 	if (!create_syphon_listeners(s)) {
 		syphon_destroy_internal(s);
@@ -941,25 +946,32 @@ static inline obs_properties_t *syphon_properties_internal(syphon_t s)
 	obs_properties_add_bool(props, "allow_transparency",
 				obs_module_text("AllowTransparency"));
 
-	obs_property_t *launch = obs_properties_add_button(
-		props, "launch inject", obs_module_text("LaunchSyphonInject"),
-		launch_syphon_inject);
+	if (@available(macOS 10.15, *)) {
+		;
+	} else {
+		obs_property_t *launch = obs_properties_add_button(
+			props, "launch inject",
+			obs_module_text("LaunchSyphonInject"),
+			launch_syphon_inject);
 
-	obs_property_t *inject = obs_properties_add_bool(
-		props, "inject", obs_module_text("Inject"));
-	obs_property_set_modified_callback(inject, toggle_inject);
+		obs_property_t *inject = obs_properties_add_bool(
+			props, "inject", obs_module_text("Inject"));
+		obs_property_set_modified_callback(inject, toggle_inject);
 
-	obs_property_t *inject_list = obs_properties_add_list(
-		props, "application", obs_module_text("Application"),
-		OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_STRING);
-	obs_property_set_modified_callback(inject_list, update_inject_list);
+		obs_property_t *inject_list = obs_properties_add_list(
+			props, "application", obs_module_text("Application"),
+			OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_STRING);
 
-	if (!get_inject_application_path())
-		obs_property_set_enabled(launch, false);
+		obs_property_set_modified_callback(inject_list,
+						   update_inject_list);
 
-	if (!is_inject_available()) {
-		obs_property_set_enabled(inject, false);
-		obs_property_set_enabled(inject_list, false);
+		if (!get_inject_application_path())
+			obs_property_set_enabled(launch, false);
+
+		if (!is_inject_available()) {
+			obs_property_set_enabled(inject, false);
+			obs_property_set_enabled(inject_list, false);
+		}
 	}
 
 	obs_property_t *crop =
@@ -1239,7 +1251,11 @@ static void syphon_update_internal(syphon_t s, obs_data_t *settings)
 		obs_data_get_bool(settings, "allow_transparency");
 
 	load_crop(s, settings);
-	update_inject(s, settings);
+	if (@available(macOS 10.15, *)) {
+		;
+	} else {
+		update_inject(s, settings);
+	}
 	if (update_syphon(s, settings))
 		create_client(s);
 }