Added checking window confit initialisation function

source/libublsettings-gtk3-window-config.c

@@ -366,4 +366,13 @@
         }
         return 0;
 
+    }
+
+    int yon_window_config_check_init(){
+        if (__yon_window_config_target_window&&__yon_window_config_path){
+            return 1;
+        } else {
+            g_error("Window configuration were not set");
+            return 0;
+        }
     }

source/libublsettings-gtk3.h

@@ -79,6 +79,8 @@ enum YON_TYPE{
 
 void yon_window_config_save_instant();
 
+int yon_window_config_check_init();
+
 /**yon_window_config_setup(GtkWindow *window)
  * [EN]
  *