Fix Core Note handle, fix AudioIO::toJson when no device

src/Core/Blank.cpp

@@ -33,11 +33,10 @@ struct ModuleResizeHandle : virtual Widget {
 	ModuleResizeHandle() {
 		box.size = Vec(RACK_GRID_WIDTH * 1, RACK_GRID_HEIGHT);
 	}
-	void onHover(const event::Hover &e) override {
-		// TODO
-		// if (e.button == 0) {
-		// 	e.target = this;
-		// }
+	void onButton(const event::Button &e) override {
+		if (e.button == GLFW_MOUSE_BUTTON_LEFT) {
+			e.consume(this);
+		}
 	}
 	void onDragStart(const event::DragStart &e) override {
 		dragX = context()->scene->rackWidget->lastMousePos.x;

src/audio.cpp

@@ -323,7 +323,8 @@ json_t *IO::toJson() {
 	json_t *rootJ = json_object();
 	json_object_set_new(rootJ, "driver", json_integer(driver));
 	std::string deviceName = getDeviceName(device);
-	json_object_set_new(rootJ, "deviceName", json_string(deviceName.c_str()));
+	if (!deviceName.empty())
+		json_object_set_new(rootJ, "deviceName", json_string(deviceName.c_str()));
 	json_object_set_new(rootJ, "offset", json_integer(offset));
 	json_object_set_new(rootJ, "maxChannels", json_integer(maxChannels));
 	json_object_set_new(rootJ, "sampleRate", json_integer(sampleRate));