#3330472: convert NULL config to empty strings before assigning them to...

#3330472: convert NULL config to empty strings before assigning them to string properties in JsonApiClient constructor to avoid type errors when the config has not been set.

Closes #3330472

src/JsonApiClient.php

@@ -44,9 +44,9 @@ class JsonApiClient implements JsonApiClientInterface {
     protected readonly ClientInterface $httpClient,
     protected readonly LoggerChannelInterface $loggerChannel,
     ConfigFactoryInterface $configFactory) {
-    $this->entrypoint = $configFactory->get('jsonapi_reference.settings')->get('endpoint');
-    $this->username = $configFactory->get('jsonapi_reference.settings')->get('username');
-    $this->password = $configFactory->get('jsonapi_reference.settings')->get('password');
+    $this->entrypoint = $configFactory->get('jsonapi_reference.settings')->get('endpoint') ?? '';
+    $this->username = $configFactory->get('jsonapi_reference.settings')->get('username') ?? '';
+    $this->password = $configFactory->get('jsonapi_reference.settings')->get('password') ?? '';
   }
 
   /**