fix(VariantManagement): add checking for selectedVariant in showSaveBtn

Fixes SAP#6622

Author: superdyzio

packages/main/src/components/VariantManagement/index.tsx

@@ -318,7 +318,8 @@ const VariantManagement = forwardRef<HTMLDivElement, VariantManagementPropTypes>
   }, [safeChildrenWithFavorites]);
 
   // todo: this applies if `readOnly` is set to `false` as well since the value is read via data-attribute and is therefore a string not a boolean
-  const showSaveBtn = dirtyState && !Object.prototype.hasOwnProperty.call(selectedVariant, 'readOnly');
+  const showSaveBtn =
+    dirtyState && selectedVariant && !Object.prototype.hasOwnProperty.call(selectedVariant, 'readOnly');
 
   return (
     <div className={variantManagementClasses} style={style} {...rest} ref={ref}>