search-result: provide key to part of community array element

invenio_app_rdm/theme/assets/semantic-ui/js/invenio_app_rdm/components/DisplayPartOfCommunities.js

@@ -4,7 +4,7 @@
 // Invenio App RDM is free software; you can redistribute it and/or modify it
 // under the terms of the MIT License; see LICENSE file for more details.
 
-import React from "react";
+import React, { Fragment } from "react";
 import PropTypes from "prop-types";
 import { i18next } from "@translations/invenio_app_rdm/i18next";
 
@@ -20,12 +20,12 @@ export const DisplayPartOfCommunities = ({ communities }) => {
           {i18next.t("Part of ")}
           {communitiesEntries.map((community, index) => {
             return (
-              <>
+              <Fragment key={community.slug}>
                 <a href={`/communities/${community.slug}`}>
                   {community.metadata?.title}
                 </a>
                 {index !== communitiesEntries.length - 1 && ", "}
-              </>
+              </Fragment>
             );
           })}
         </>