fix: handle invalid Algolia keys gracefully in dev (#37088)

Invalid keys throw an error in production, but just cause invalid
PropTypes and build warnings in development.

client/src/components/search/WithInstantSearch.js

@@ -20,7 +20,11 @@ import { createSelector } from 'reselect';
 
 const DEBOUNCE_TIME = 100;
 
-const searchClient = algoliasearch(algoliaAppId, algoliaAPIKey);
+// If a key is missing, searches will fail, but the client will still render.
+const searchClient =
+  algoliaAppId && algoliaAPIKey
+    ? algoliasearch(algoliaAppId, algoliaAPIKey)
+    : {};
 
 const propTypes = {
   children: PropTypes.any,