Add default constructor

src/UI/UI_led.cpp

@@ -1,5 +1,9 @@
 #include "UI_led.hpp"
 
+UI_led::UI_led(QObject *parent) : UI_item(UI_LED_TYPE, "", 12, Color::Default, Color::Default, parent)
+{
+}
+
 UI_led::UI_led(std::string text, Color fg_color, Color bg_color, QObject *parent)
     : UI_item(UI_LED_TYPE, text, 12, fg_color, bg_color, parent)
 {

src/UI/UI_led.hpp

@@ -8,6 +8,7 @@ class UI_led : public UI_item
 {
     Q_OBJECT
   public:
+    UI_led(QObject *parent = nullptr);
     UI_led(std::string text, Color fg_color, Color bg_color, QObject *parent = nullptr);
     UI_led(const json &j, QObject *parent = nullptr);