Fix: IE11 close issue fix

* IE11 close issue fix

* Also fix focus issue, if there actually was a focused element

* refactor: use optional chaining

Co-authored-by: Youssouf EL Azizi <[email protected]>

Author: dhrimov

src/index.tsx

@@ -108,7 +108,7 @@ export const Popup = forwardRef<PopupActions, PopupProps>(
     ) => {
       if (!isOpen || disabled) return;
       setIsOpen(false);
-      if (isModal) (focusedElBeforeOpen.current as HTMLElement).focus();
+      if (isModal) (focusedElBeforeOpen.current as HTMLElement)?.focus();
       setTimeout(() => onClose(event), 0);
     };