Fix bug of ContextMenu on adding new state fixed

Now if adding new state fails, ContextMenu closes

Author: RezaKargar

js/app.js

@@ -451,7 +451,10 @@ cnv.oncontextmenu = function (e) {
                         const { x, y } = contextMenuPos;
                         const name = prompt('whats name of state you wanna create ?');
 
-                        if (name === null || !name.trim()) return;
+                        if (name === null || !name.trim()){
+                            contextMenu();
+                            return;
+                        } 
 
                         try {
                             fa.addState({