minor fix

Author: Masakorala, Manoj

lib/index.browser.js

@@ -149,12 +149,12 @@ class NodeModel {
             if (this.flatNodes[value].multiInputValue) {
                 list.filter((el) => el.hotel === this.flatNodes[value].value).length > 0 &&
                 list.map(p => p.hotel === value
-                                      ? { ...p,  rates: key.rates.map(i => i.value) }
+                                      ? { ...p,  rates: key?.rates.map(i => i.value) }
                                       : p
                                   );
                 list.filter((el) => el.hotel === this.flatNodes[value].value).length === 0 && list.push({ hotel: value, rates: this.flatNodes[value].multiInputValue });
             } else {
-              list.filter((el) => el.hotel === key.hotel).length === 0 && list.push( {hotel: key.hotel, rates: key.rates.map(v => v.value) } );
+              list.filter((el) => el.hotel === key.hotel).length === 0 && list.push( {hotel: key.hotel, rates: key?.rates.map(v => v.value) } );
             }
         });
         return list;